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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 1: Free Oscillations in One Dimension Simle Harmonic Oscillator"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.10: velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 10 // ENERGY\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"t=8/3;//seconds\n",
+"v=-10*%pi*sin((35*%pi)/6)//cm\n",
+"disp(v,'velocity is,(cm)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.11: frequency_energy_and_velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 11 // \n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"K1=3;// in N/m\n",
+"K2=2;// in N/m\n",
+"m=0.050;// in kg\n",
+"w=sqrt((K1+K2)/m);\n",
+"n=w/(2*%pi);\n",
+"disp(n,'(i). The frequency,n(oscillations/sec) = ')\n",
+"A=0.004;// in m\n",
+"E=(1/2)*A^2*(K1+K2);\n",
+"disp(E,'(ii). The energy,E(J) = ')\n",
+"v=sqrt(2*E/m);\n",
+"disp(v,'(iii). The velocity,v(m/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.12: rotational_inertia.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 12 // Rotational inertia\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"M=0.1;// in m\n",
+"l=0.1;// in m\n",
+"I1=M*l^2/12;// in kg-m^2\n",
+"T1=2;// in s\n",
+"T2=6;// in s\n",
+"I2=(I1*T2^2)/T1^2;\n",
+"disp(I2,'Rotational inertia,I2(kg.m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.13: period.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 13 // Time period\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"M=4;// in kg\n",
+"R=0.10;// in m\n",
+"I=(2/5)*M*R^2;// in kg.m^2\n",
+"C=4*10^-3;// in Nm/radian\n",
+"T=2*%pi*sqrt(I/C);\n",
+"disp(T,'Time period,T(s) = ')\n",
+"// answer is wrong in textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.15: frequency_and_energy.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 15 // Energy\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"L=10*10^-3;// in H\n",
+"C=20*10^-6;// in F\n",
+"n=1/(2*%pi*sqrt(L*C));\n",
+"V=10;//in V\n",
+"U=(1/2)*C*V^2;\n",
+"disp(n,'Frequency,n(cycles/s) = ')\n",
+"disp(U,'Energy of oscillations,U(J) = ')\n",
+"//answer of frequency is calculated wrong in textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.16: distance_binding_energy_and_force_constant.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 16 // distance,binding energy and force constant\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"disp('equilibrium inter-nuclear distance correspondes to lowest potential enegy is ro= 2*Å')\n",
+"pet=0;//eV\n",
+"peb=-4;//eV\n",
+"be=pet-peb;//eV\n",
+"x1=-2;//eV\n",
+"x2=-4;//eV\n",
+"V=x1-x2;//eV\n",
+"e=1.6*10^-19;//electronic charge\n",
+"x=0.5;//armstrong\n",
+"K=((2*V)/x^2);//eV/Å^2\n",
+"k1=(K*e)/(10^-10)^2;//joule/m^2\n",
+"disp(be,'binding energy is ,(eV)=')\n",
+"disp(k1,'force constant is ,(newton/metre)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.17: possible_values_of_r_and_energy.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 17 // possible values and energy\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"r1=2;//from graph\n",
+"r2=4.5;//units from graph\n",
+"disp('possible values of r are '+string(r1)+' units and '+string(r2)+' units')\n",
+"osc=1-(-2.5);//units\n",
+"disp('maximum energy of oscillations for r=2 units is '+string(osc)+' units ')\n",
+"osc1=0.5-(-1);//units\n",
+"disp('maximum energy of oscillations for r=4.5 units is '+string(osc1)+' units ')\n",
+"t=1;//from graph\n",
+"v=0;//from graph\n",
+"e=t+v;//\n",
+"disp(e,'total energy is,(unit)=')\n",
+"disp('at infinity V = '+string(v)+' therefore T = '+string(t)+' unit ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.19: frequency_and_moment_of_inertia.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 19 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"m1=10;// in g\n",
+"m2=90;// in g\n",
+"K=10^3;// in N/m\n",
+"mu=m1*m2*10^-3/(m1+m2);\n",
+"n=round(sqrt(K/mu)/(2*%pi));\n",
+"disp(n,' The frequency,n(oscillations/sec) = ')\n",
+"x1=0;//\n",
+"x2=10;//cm\n",
+"xb=((m1*x1+m2*x2)/(m1+m2));//cm\n",
+"mo=(m1*10^-3)*(xb*10^-2)^2+(m2*10^-3)*(1*10^-2)^2;//\n",
+"disp(mo,'moment of inertia is ,(kg-m^2)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.1: frequency_and_time_period.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 //  FREQUENCY AND TIME PERIOD\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"format('v',6)\n",
+"//ph=50*x^2+100 in joule/kg\n",
+"m=10;//mass in kg\n",
+"f=10^3/m;//joule/kg\n",
+"w=sqrt(f);//oscillations\n",
+"fr=w/(2*%pi);//oscillations/sec\n",
+"tp=1/fr;//seconds\n",
+"disp(fr,'frequency of oscillation is ,(oscillations/seconds)=')\n",
+"disp(tp,'time period is,(seconds)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.20: frequency_and_amlitude.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 20 // frequency and amplitude\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"c=10^-4;//N-m\n",
+"m1=9;//gm\n",
+"m2=1;//gm\n",
+"mu=((m1*m2)/(m1+m2))*10^-3;//kg\n",
+"r=20;//cm\n",
+"I=mu*(r*10^-2)^2;//kg-m^2\n",
+"fr=((1/(2*%pi))*sqrt(c/I));//vibrations/sec\n",
+"disp(fr,'frequency of vibration is ,(vibrations/s)=')\n",
+"e=10^-2;//joule\n",
+"thmax=sqrt((2*e)/c);//radians\n",
+"disp(thmax,'amplitude is,(radians)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.21: frequency_energy_and_velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 21 // frequency ,energy and maximum velocity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"c=1;//N-m \n",
+"m1=6;//gm\n",
+"m2=2;//gm\n",
+"mu=((m1*m2)/(m1+m2))*10^-3;//kg\n",
+"fr=((1/(2*%pi))*sqrt(c/mu));//vibrations/sec\n",
+"disp(fr,'frequency of oscillations is ,(vibrations/s)=')\n",
+"td= 1+(1/3);//cm\n",
+"e=((1/2)*c*(td*10^-2)^2);//joule\n",
+"disp(e,'energy is,(joule)=')\n",
+"y=((1/2)*m2*10^-3)+((1/2)*(1/3)^2*m1*10^-3);//\n",
+"v1=sqrt((e/y));//m/sec\n",
+"disp(v1,'maximum velocity of smaller mass is,(m/seconds)=')\n",
+"//velocity is calculated wrong in the book"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.22: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 22 // frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"k=100;//N/m\n",
+"m=100;//gm\n",
+"n1=((1/(2*%pi))*sqrt(k/(m*10^-3)));//sec^-1\n",
+"m1=100;//gm\n",
+"m2=200;//gm\n",
+"mu=((m1*m2)/(m1+m2))*10^-3;//kg\n",
+"fr=((1/(2*%pi))*sqrt(k/mu));//sec^-1\n",
+"disp(n1,'in first case frequency is,(sec^-1)=')\n",
+"disp(fr,'in second case frequency is,(sec^-1)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.23: force_constant_and_work_done.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 23 // force constant and work done\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"m1=1;//assume\n",
+"m2=19;//assume\n",
+"mh=1.66*10^-27;//kg\n",
+"mu=((m1*m2)/(m1+m2))*mh;//kg\n",
+"w=7.55*10^14;//radians/sec\n",
+"k=mu*(w)^2;//N/m\n",
+"disp(k,'force constant is,(N/m)=')\n",
+"x=0.5;//arngstrom\n",
+"wh=((1/2)*k*(x*10^-10)^2);//joule\n",
+"disp(wh,'work done is ,(joule)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.24: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 24 // frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"m1=1;//a.m.u\n",
+"m2=35;//a.m.u\n",
+"mu1=((m1*m2)/(m1+m2));//a.m.u\n",
+"m3=2;//\n",
+"mu2=((m3*m2)/(m3+m2));//a.m.u\n",
+"n1=8.99*10^13;//cycle/sec\n",
+"n2=(sqrt(mu1/mu2))*n1;//c/s\n",
+"disp(n2,'frequecy of vibrations is ,(c/s)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.3: total_energy.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // ENERGY\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"ke=5;//joule\n",
+"pe=5;//joule\n",
+"rep=10;//joule\n",
+"eo=rep+ke+pe;//joule\n",
+"disp(eo,'energy of the oscillator is,(joule)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.4: velocity_and_acceleration.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 //  peroid ,maximum velocity and acceleration\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"a=3;//cm\n",
+"b=4;//cm\n",
+"A=sqrt(a^2+b^2);//cm\n",
+"w=2;//sec^-1\n",
+"T=(2*%pi)/w;//seconds\n",
+"um=w*A;//cm/s\n",
+"am=w^2*A;//cm/s^2\n",
+"disp(T,'time period is ,(seconds)=')\n",
+"disp(um,'maximum velocity is,(cm/s)=')\n",
+"disp(am,'maximum acceleration is,(cm/s^2)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.5: velocity_and_acceleration.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5 // maximum velocity and acceleration\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"A=5;//cm\n",
+"T=31.4//seconds\n",
+"w=(2*%pi)/T;//sec^-1\n",
+"um=w*A;//cm/s\n",
+"am=w^2*A;//cm/s^2\n",
+"disp(um,'maximum velocity is,(cm/s)=')\n",
+"disp(am,'maximum acceleration is,(cm/s^2)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.6: period.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6 //  Period \n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"g=9.8;// constant\n",
+"l=1;// in m\n",
+"theta_m1=60;// in degree\n",
+"theta_m=%pi/3;// in radians\n",
+"T0=round(2*%pi*sqrt(l/g));\n",
+"disp(T0,'(a). Time period for small displacement,T0(seconds) = ')\n",
+"T=T0*(1+(theta_m^2/16));\n",
+"disp(T,'(b).Time period,T(seconds) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.7: energy.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 7 // ENERGY\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"es=1;//joule\n",
+"l=2;//metre\n",
+"am=3;//cm\n",
+"am1=5;//cm\n",
+"e1=(am1^2/am^2)*es;//joules\n",
+"l2=1;//meter\n",
+"e2=(l/l2)*es;//joules\n",
+"disp(e1,'energy in first case is,(joules)=')\n",
+"disp(e2,'energy in second case is,(joules)= ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.8: period_of_motio.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 8 //  Period of motion\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"x=0.16;// in m\n",
+"m1=4;// in kg\n",
+"g=9.8;\n",
+"K=m1*g/x;\n",
+"m=0.50;// in kg\n",
+"T=2*%pi*sqrt(m/K);// \n",
+"disp(T,'The period of motion ,T(seconds) = ')\n",
+"// answer is wrong in textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.9: force_constant_period_of_oscillation_amlitude_and_energy.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9 //foce constant,displacement , acceleration and energy\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"x1=.10;// in m\n",
+"F1=4;// in N\n",
+"K=F1/x1;\n",
+"x2=0.12;// in m\n",
+"disp(K,'(a). The force constant,K(N/m) = ')\n",
+"F=-K*x2;\n",
+"disp(F,'(b). The force,F(N) = ')\n",
+"m=1.6;// in kg\n",
+"T=2*%pi*sqrt(m/K);\n",
+"disp(T,'(c). Period of pscillation,T(s) = ')\n",
+"A=x2;\n",
+"disp(A,'(d). Amplitude of motion,A(m) = ')\n",
+"alfa=A*K/m;\n",
+"disp(alfa,'(e). Maximum acceleration,alfa(m/s^2) = ')\n",
+"x=A/2;// in m\n",
+"w=sqrt(K/m);\n",
+"v=w*sqrt(A^2-x^2);\n",
+"a=w^2*x;// in m/s^2\n",
+"KE=(1/2)*m*v^2;// in J\n",
+"PE=(1/2)*K*x^2;// in J\n",
+"TE=KE+PE;\n",
+"disp(v,'(f) velocity is,(m/s) ')\n",
+"disp(a,'(f). acceleration,(m/s^2) = ')\n",
+"disp(KE,'(f) Kinetic energy is ,(J)=')\n",
+"disp(PE,'(f) Potential energy is ,(J)=')\n",
+"disp(TE,'(g). Total energy of the oscillating system,TE(J) = ')\n",
+"// in textbook part f is inculded in the part e so their is the numbeing error in parts"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/10-Waves_in_SolidsWaves_in_Solids.ipynb b/Oscillations_and_Waves_by_S_Prakesh/10-Waves_in_SolidsWaves_in_Solids.ipynb
new file mode 100644
index 0000000..1c5c0c0
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/10-Waves_in_SolidsWaves_in_Solids.ipynb
@@ -0,0 +1,359 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 10: Waves in SolidsWaves in Solids"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.10: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 10 // Frequencies\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"l=2;// in m\n",
+"v=3560;// in m/s\n",
+"r=0.004;// in m\n",
+"k=r/2;\n",
+"v1=%pi*v*k*3.011^2/(8*l^2);\n",
+"disp(v1,'The frequency,v1(Hz) = ')\n",
+"v2=%pi*v*k*5^2/(8*l^2);\n",
+"disp(v2,'The frequency of first overtone,v2(Hz) = ')\n",
+"v3=%pi*v*k*7^2/(8*l^2);\n",
+"disp(v3,'The frequency of second overtone,v3(Hz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.11: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 11 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"Y=7.1*10^10;// in N/m^2\n",
+"p=2.7*10^3;// in kg/m^3\n",
+"r=0.005;// in m\n",
+"vu=sqrt(Y/p);\n",
+"k=r/2;\n",
+"v=vu/(2*%pi*k);\n",
+"disp(v,' The frequency,v(Hz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.1: youngs_modulus.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 // Young's modulus of steel\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"p=7.8*10^3;// in kg/m^3\n",
+"v=5200;// m/s\n",
+"Y=p*v^2;\n",
+"disp(Y,'Young modulus of steel,Y(N/m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.2: wavelength_and_velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 // Velocity and wavelength\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"Y=8*10^10;// in N/m^2\n",
+"p=5000;// in kg/m^3\n",
+"v=sqrt(Y/p);\n",
+"disp(v,'(1). The velocity,v(m/s) = ')\n",
+"f=400;// in vibration/sec\n",
+"lamda=v/f;\n",
+"disp(lamda,'(2). The wavelength,(m) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.3: velocity_and_wavelength.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // Velocity and wavelength\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"Y=7*10^10;// in N/m^2\n",
+"p=2.8*10^3;// in kg/m^3\n",
+"v=sqrt(Y/p);\n",
+"disp(v,'(1). The velocity,v(m/s) = ')\n",
+"f=500;// in vibration/sec\n",
+"lamda=v/f;\n",
+"disp(lamda,'(2). The wavelength,(m/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.4: youngs_modulus.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 // Young's modulus\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"l=3;// in m\n",
+"n=600;// in Hz\n",
+"p=8.3*10^3;// in kg/m^3\n",
+"Y=p*n^2*(2*l)^2;\n",
+"disp(Y,'Youngs modulus,Y(N/m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.5: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"Y=2*10^11;// in N/m^2\n",
+"p=8*10^3;// in kg/m^3\n",
+"l=0.25;// in m\n",
+"n=sqrt(Y/p)/(2*l);\n",
+"disp(n,'The frequency,n(vibrations/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.6: AREA.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6 // Area of cross section\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"n1BYn2=20;\n",
+"T=20*9.8;// in N\n",
+"Y=19.6*10^10;// in N/m^2\n",
+"alfa=n1BYn2^2*T/Y;\n",
+"disp(alfa,'Area of cross section,alfa(m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.7: velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 7 // Velocity and Young modulus\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"n=2600;// in Hz\n",
+"l=1;// in m\n",
+"p=7.8*10^3;// kg/m^3\n",
+"v=2*n*l;\n",
+"disp(v,'The velocity,v(m/s) = ')\n",
+"Y=v^2*p;\n",
+"disp(Y,'Youngs modulus,Y(N/m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.8: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 8 // Frequencies\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"Y=7.1*10^10;// in N/m^2\n",
+"p=2700;//in kg/m^3\n",
+"l=1.5;// in m\n",
+"r1=1;\n",
+"r2=3;\n",
+"r3=5;\n",
+"n1=(r1/(4*l))*sqrt(Y/p);\n",
+"n2=(r2/(4*l))*sqrt(Y/p);\n",
+"n3=(r3/(4*l))*sqrt(Y/p);\n",
+"disp(n1,'frequency of first harmonic,n1(Hz) = ')\n",
+"disp(n2,'frequency of first harmonic,n1(Hz) = ')\n",
+"disp(n3,'frequency of first harmonic,n1(Hz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 10.9: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"l=1.2;// in m\n",
+"v=5150;// in m/s\n",
+"d=0.006;// in m\n",
+"k=d/sqrt(12);\n",
+"v1=%pi*v*k*3.011^2/(8*l^2);\n",
+"disp(v1,'The frequency,v1(Hz) = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/11-Lissajous_Figures.ipynb b/Oscillations_and_Waves_by_S_Prakesh/11-Lissajous_Figures.ipynb
new file mode 100644
index 0000000..aa29ce7
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/11-Lissajous_Figures.ipynb
@@ -0,0 +1,128 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 11: Lissajous Figures"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 11.1: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1// Frequencies\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"t=2;// in sec\n",
+"n1=100;// in vibrations/sec\n",
+"n2a=n1+(1/t);\n",
+"n2b=n1-(1/t);\n",
+"disp(n2a,'frequency,n2a= ')\n",
+"disp(n2b,'frequency,n2b = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 11.2: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2// Frequencies\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"t1=15;// in sec\n",
+"t2=10;// in sec\n",
+"n2=400;// in vibrations/sec\n",
+"n1a=n2+(1/t1);\n",
+"n1b=n2-(1/t1);\n",
+"disp(n1a,'frequency,n1a(Hz) = ')\n",
+"disp(n1b,'frequency,n1b(Hz) = ')\n",
+"n_1a=n2+(1/t2);\n",
+"n_1b=n2-(1/t2);\n",
+"disp(n_1a,'frequency,n_1a(Hz) = ')\n",
+"disp(n_1b,'frequency,n_1b(Hz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 11.3: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3// Frequencies\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"t1=15;// in sec\n",
+"t2=10;// in sec\n",
+"n2=256;// in vibrations/sec\n",
+"n1a=(2*n2)+(1/t1);\n",
+"n1b=(2*n2)-(1/t1);\n",
+"disp(n1a,'frequency,n1a(Hz) = ')\n",
+"disp(n1b,'frequency,n1b(Hz) = ')\n",
+"n_1a=(2*n2)+(1/t2);\n",
+"n_1b=(2*n2)-(1/t2);\n",
+"disp(n_1a,'frequency,n_1a(Hz) = ')\n",
+"disp(n_1b,'frequency,n_1b(Hz) = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/12-Dopplers_Effect.ipynb b/Oscillations_and_Waves_by_S_Prakesh/12-Dopplers_Effect.ipynb
new file mode 100644
index 0000000..602d0d4
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/12-Dopplers_Effect.ipynb
@@ -0,0 +1,448 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 12: Dopplers Effect"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.10: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 10//frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"sa=1.5;//km\n",
+"oa=1;//km\n",
+"so=sqrt(oa^2+sa^2);//km\n",
+"csd=sa/so;//\n",
+"v=0.33;//km/s\n",
+"n=400;//Hz\n",
+"vlov=120*(1000/3600);//m/s\n",
+"vs1=(1/30)*csd;//km/s\n",
+"nd=((v)/(v-vs1))*n;//vibrations/sec\n",
+"disp(round(nd),'apparent frequency is,(vibrations/second)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.11: frequency_and_distance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 11//frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"v=1200;//km/h\n",
+"w=40;//km/h\n",
+"vs=40;//km/h\n",
+"n=580;//Hz\n",
+"nd=((v+vs)/((v+vs)-vs))*n;//Hz\n",
+"disp(nd,'frequency of the whistle as heared by an observer on the hill is ,(Hz)=')\n",
+"x=29/30;//km\n",
+"disp(x*1000,'distance is ,(m)=')\n",
+"ndd=((v-w)+vs)/((v-w))*nd;//Hz\n",
+"disp(ndd,'frequency heared by driver is,(Hz)=')\n",
+"//distance is calculated wrong in the textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.12: Doppler_shift_and_velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 12//doppler shift and velocity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"h1=6010;//Å\n",
+"h2=6000;//Å\n",
+"ds=h1-h2;//Å\n",
+"disp(ds,'doppler shift is ,(Å)=')\n",
+"c=3*10^8;//m/s\n",
+"v=((ds/h2)*c);//m/s\n",
+"disp(v,'speed is ,(m/s)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.13: velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 13//doppler shift and velocity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"h1=3737;//Å\n",
+"h2=3700;//Å\n",
+"ds=h1-h2;//Å\n",
+"disp(ds,'doppler shift is ,(Å)=')\n",
+"c=3*10^8;//m/s\n",
+"v=((ds/h2)*c);//m/s\n",
+"disp(v,'speed is ,(m/s)=')\n",
+"//speed is  calculated wrong in the textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.14: speed.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 14//speed\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"dv=10^3;//Hz\n",
+"v=5*10^9;//Hz\n",
+"c=3*10^8;//m/s\n",
+"v=((dv)/(2*v))*c;//m/s\n",
+"disp(v,'velocity is ,(m/s)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.1: speed.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1// Speed\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"vl=166;//m/s\n",
+"v=(2*vl);//m/s\n",
+"disp(v,'speed is,(m/s)')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.2: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2// frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"f1=90;//vibrations/second\n",
+"f2=(1+(1/10))*f1;//vibrations/s\n",
+"disp(f2,'frequency is,(vibrations/s)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.3: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3// frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"N=400;//hZ\n",
+"V=340;//M/S\n",
+"VS=60;//M/S\n",
+"N2=((V/(V-VS))*N);//Hz\n",
+"disp(round(N2),'frequency when engine is approaching to the listner is,(Hz)=')\n",
+"N3=((V/(V+VS))*N);//Hz\n",
+"disp(N3,'frequency when engine is moving away from the listner is,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.4: wavelength.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4//WAVELENGTH\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"x=1/5;//\n",
+"h=60;//cm\n",
+"h1=((1-x)*h);//cm\n",
+"h2=((1+x)*h);//cm\n",
+"disp(h1,'wavelength of waves in north-direction is,(cm)=')\n",
+"disp(h2,'wavelength of waves in south-direction is,(cm)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.5: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5//frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"v=340;//m/s\n",
+"n=600;//Hz\n",
+"vs=36;//km h^-1\n",
+"vs1=vs*(1000/3600);//m/s\n",
+"apf=((v)/(v-vs1))*n;//Hz\n",
+"vs2=54;//km h^-1\n",
+"vs3=vs2*(1000/3600);//m/s\n",
+"apf1=((v)/(v+vs3))*n;//Hz\n",
+"disp('two apparent frequencies are '+string(apf)+' Hz and '+string(apf1)+' Hz')\n",
+"df=apf-apf1;//Hz\n",
+"disp(df,'difference in frequencies is ,(Hz)=')\n",
+"//second apparent frequency and difference is calculated wrong in the textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.6: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6//frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"v=330;//m/s\n",
+"n=500;//Hz\n",
+"vs=30;//km h^-1\n",
+"vs1=vs*(1000/3600);//m/s\n",
+"n3=((v+vs1)/(v-vs1))*n;//Hz\n",
+"disp(round(n3),'frequency when cars are approaching is ,(Hz)=')\n",
+"n1=((v-vs1)/(v+vs1))*n;//Hz\n",
+"disp(round(n1),'frequency when cars have crossed  is ,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.7: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 7//frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"v=330;//m/s\n",
+"n=600;//Hz\n",
+"vs=20;//m/s\n",
+"apf=((v)/(v+vs))*n;//Hz\n",
+"disp(round(apf),'frequency when source is moving away from the observer is ,(Hz)=')\n",
+"apf1=((v)/(v-vs))*n;//Hz\n",
+"disp(round(apf1),'frequency when siren reaching at the cliff is ,(Hz)=')\n",
+"bf=apf1-apf;//Hz\n",
+"disp(round(bf),'beat frequency is ,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.8: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 8//frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"r=3;//m\n",
+"w=10;//s^-1\n",
+"vs=r*w;//m/s\n",
+"A=6;//m\n",
+"fd=5/%pi;//s^-1\n",
+"vmax=A*2*%pi*fd;//m/s\n",
+"v=330;//m/s\n",
+"n=340;//Hz\n",
+"nmax=((v+vmax)/(v-vs))*n;//Hz\n",
+"nmin=((v-vmax)/(v+vs))*n;//Hz\n",
+"disp(nmax,'maximum frequency is,(Hz)=')\n",
+"disp(nmin,'minimum frequency is ,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.9: speed.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9//speed\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"n12=3;//\n",
+"n=340;//Hz\n",
+"v=340;//m/s\n",
+"vs=((n12*v)/(2*n));//m/s\n",
+"disp(vs,'speed is ,(m/s)=')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/13-Elementary_Theory_of_Filters.ipynb b/Oscillations_and_Waves_by_S_Prakesh/13-Elementary_Theory_of_Filters.ipynb
new file mode 100644
index 0000000..1948073
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/13-Elementary_Theory_of_Filters.ipynb
@@ -0,0 +1,95 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 13: Elementary Theory of Filters"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 13.1: inductance_and_capacitance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 //  design loss pass constant K-filter\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"k=600;//ohms\n",
+"fc=2500;//Hz\n",
+"l=(k/(%pi*fc));//H\n",
+"c=((1/(%pi*fc*k)));//farad\n",
+"disp(l*10^3,'inductance is ,(mH)=')\n",
+"disp(c*10^6,'capacitance is ,(micro-F)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 13.2: inductance_and_capacitance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 //  T-type band pass filter\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"K=500;// in ohm\n",
+"f1=4;// in kHz\n",
+"f2=1;// in kHz\n",
+"L1=K/(%pi*(f1-f2));\n",
+"Ls=L1/2;\n",
+"disp(Ls,'Inductance in each series arm,Ls(mH) = ')\n",
+"C1=(f1-f2)*10^3/(4*%pi*K*f1*f2);\n",
+"Cs=2*C1;\n",
+"disp(Cs,'Capacity in each series arm,Cs(micro-F) = ')\n",
+"L2=((f1-f2)*K)/(4*%pi*f1*f2);\n",
+"disp(L2,'Shunt arm inductance,L2(mH) = ')\n",
+"Csh=1*10^6/(%pi*(f1-f2)*10^3*K);\n",
+"disp(Csh,'Capacity in shunt arm,Csh(micro-F) = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/14-Ultrasonics.ipynb b/Oscillations_and_Waves_by_S_Prakesh/14-Ultrasonics.ipynb
new file mode 100644
index 0000000..9dcd377
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/14-Ultrasonics.ipynb
@@ -0,0 +1,141 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 14: Ultrasonics"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 14.1: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 // Fundamental frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"t=1.6*10^-3;// in m\n",
+"lamda=2*t;// in m\n",
+"v=5760;// in m/s\n",
+"n1=v*10^-6/lamda;\n",
+"disp(n1,'Fundamental frequency,n1(MHz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 14.2: Length.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 //  distance\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"th=40;//cm\n",
+"t1=30;//micro-seconds\n",
+"t2=80;//micro seconds\n",
+"x=((2*th*10^-2*t1*10^-6)/(2*t2*10^-6))*100;//cm\n",
+"disp(x,'distance is ,(cm)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 14.3: thickness.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // Thickness\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"v=5000;// in m/s\n",
+"N=50000;// in Hz\n",
+"t=v/(2*N);\n",
+"disp(t,'Thickness of steel plate,t(m) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 14.4: capacitance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 //  Capacitance\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"L=1;// in H\n",
+"n=10^6;// in Hz\n",
+"C=1*10^12/(4*%pi^2*n^2*L);\n",
+"disp(C,'The capacitance,C(micro-F) = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/15-Musical_Sound_and_Acoustic_of_Bulidings.ipynb b/Oscillations_and_Waves_by_S_Prakesh/15-Musical_Sound_and_Acoustic_of_Bulidings.ipynb
new file mode 100644
index 0000000..421aeb1
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/15-Musical_Sound_and_Acoustic_of_Bulidings.ipynb
@@ -0,0 +1,115 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 15: Musical Sound and Acoustic of Bulidings"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.1: levels_by_which_intensity_will_decrease.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 // decibles\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"i1=4;//assume\n",
+"i2=4*i1;//\n",
+"dl=10*log10(i2/i1);//db\n",
+"disp(dl,'decibles by which intensity level will decrease is,(db)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.2: ratio_of_amplitudes.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 // ratio of amlitudes\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"l1=10;//db\n",
+"l2=40;//db\n",
+"dl=l2-l1;//db\n",
+"x=(10^(dl/10));//\n",
+"x1=sqrt(x);//\n",
+"disp(x1,'ratio of amplitudes is ,=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.3: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"x=264;//key note\n",
+"g=x*(3/2);//\n",
+"disp(g,'frequency of note G is ,=')\n",
+"cd1=x*2;//\n",
+"disp(cd1,'frequency of note C is ,=')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/17-Electromagnetic_Waves.ipynb b/Oscillations_and_Waves_by_S_Prakesh/17-Electromagnetic_Waves.ipynb
new file mode 100644
index 0000000..34ccc68
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/17-Electromagnetic_Waves.ipynb
@@ -0,0 +1,213 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 17: Electromagnetic Waves"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.1: poynting_vector.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 // magnitude\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"R=7*10^8;// in m\n",
+"P=3.8*10^26;// in Watt\n",
+"S=P/(4*%pi*R^2);\n",
+"disp(S,'Magnitude of poynting vector,S(W/m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.2: poynting_vector.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 // Poynting vector\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"R=1.5*10^11;// in m\n",
+"P=3.8*10^26;// in Watt\n",
+"S=P/(4*%pi*R^2);// in W/m^2\n",
+"Se=round(S*60/(4.2*10^4));\n",
+"disp(Se,'Poynting vector,Se(cal/cm^2 -min) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.3: amplitudes_of_electric_and_magnetic_field_radiation.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // Amplitude and magnetic field\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"S=2;// in cal/cm^2- min\n",
+"EH=S*4.2*10^4/60;// joule/m^2 sec\n",
+"mu0=4*%pi*10^-7;\n",
+"epsilon0=8.85*10^-12;\n",
+"EbyH=sqrt(mu0/epsilon0);\n",
+"E=sqrt(EH*EbyH);\n",
+"H=EH/E;\n",
+"E0=E*sqrt(2);\n",
+"H0=H*sqrt(2);\n",
+"disp(E,'E is ,(V/m)=')\n",
+"disp(H,'H is ,(Amp-turn/m)=')\n",
+"disp(E0,'Amplitude of electric fields of radiation,E0(V/m) = ')\n",
+"disp(H0,'Magnetice field of radition ,H0(Amp-turn/m) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.4: amplitudes_of_electric_and_magnetic_field_radiation.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 // electric and magnetic field\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"r=2;// in m\n",
+"mu0=4*%pi*10^-7;\n",
+"epsilon0=8.85*10^-12;\n",
+"EbyH=sqrt(mu0/epsilon0);\n",
+"EH=1000/(4*r^2*%pi^2);// in W/m^2\n",
+"E=sqrt(EH*EbyH);\n",
+"H=(EH/E);\n",
+"disp(E,'Intensities of electric,E(V/m) = ')\n",
+"disp(H,'Magnetic field of radiation,H(Amp-turn/m) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.5: polarisation_degree.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5 // Degree of polarization\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"thetai=45;// in degree\n",
+"n=1.5;/// index\n",
+"thetar=asind(sind(thetai)/n);\n",
+"Rl=sind(thetai-thetar)^2/sind(thetai+thetar)^2;\n",
+"Rp=tand(thetai-thetar)^2/tand(thetai+thetar)^2;\n",
+"D=((Rl-Rp)/(Rl+Rp))*100;\n",
+"disp(D,'Degree of polarization,D(%) = ')\n",
+"// answer is wrong in the textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.6: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"del=1;// in m\n",
+"mu=4*%pi*10^-7;// in H/m\n",
+"sigma=4;// in siemen/m\n",
+"v=1*10^-3/(%pi*del^2*mu*sigma);\n",
+"disp(v,'Frequency,v(kHz) = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/2-Damped_Harmonic_Oscillator.ipynb b/Oscillations_and_Waves_by_S_Prakesh/2-Damped_Harmonic_Oscillator.ipynb
new file mode 100644
index 0000000..77c7450
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/2-Damped_Harmonic_Oscillator.ipynb
@@ -0,0 +1,376 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 2: Damped Harmonic Oscillator"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.10: logarithmic_decrement.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 10 // Logarithmic decrement\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"a=100;\n",
+"l1=20;// in cm\n",
+"l2=2;// in cm\n",
+"l=l1/l2;\n",
+"lamda=(1/100)*log(l);\n",
+"disp(lamda,' Logarithmic decrement, = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.12: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 12 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"C=10^-6;// in F\n",
+"L=0.2;// in H\n",
+"R=800;// in ohm\n",
+"Rm=2*sqrt(L/C);\n",
+"n=sqrt((1/(L*C))-(R^2/(4*L^2)))/(2*%pi);\n",
+"disp(n,'The frequency,n(cycles/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.13: resistance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 13 // Resistance\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"C=0.0012*10^-6;// in F\n",
+"L=0.2;// in H\n",
+"Rm=2*sqrt(L/C);\n",
+"disp(Rm,'The maximum value of resistance,Rm(ohms) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.14: frequency_and_quality_factor.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 14 // Q factor\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"C=5*10^-6;// in F\n",
+"L=2*10^-3;// in H\n",
+"R=0.2;// in ohm\n",
+"w=round(sqrt((1/(L*C))-(R^2/(4*L^2))));\n",
+"f=w/(2*%pi);\n",
+"Q=w*L/R;\n",
+"disp(f,'frequency is ,(Hz)=')\n",
+"disp(Q,'Quality factor,Q = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.3: time_damping_force_total_distance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // relaxation time ,damping force ,time and total distance\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"v=10;//cm/s\n",
+"vo=100;//cm/s\n",
+"t=23;//sec\n",
+"x=-(log(v/vo))/t;//\n",
+"t=(1/x)*1;//seconds\n",
+"disp(round(t),'relaxation time is,(seconds)=')\n",
+"m=40;//gm\n",
+"vx=50;//cm/sec\n",
+"fd=((-x*m*10^-3*vx*10^-2));//newton\n",
+"disp(fd,'damping force is ,(newton)=')\n",
+"tx=5*(log(10));//\n",
+"disp(tx,'time in which kinetic energy will reduce to 1/10th of its value is ,(seconds)=')\n",
+"xx=v*1;//\n",
+"disp(xx,'distance travelled is,(m)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.4: period.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 // period\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"m=2;// in g\n",
+"k=30;// in dynes/cm\n",
+"b=5;// in dynes/cm-sec^-1\n",
+"r=b/(2*m);\n",
+"w0=sqrt(k/m);\n",
+"T=2*%pi/sqrt(w0^2-r^2);\n",
+"disp(T,'The time period,T(s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.5: time_period.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5 // time\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"tr=50;//seconds\n",
+"r=(1/(2*tr));//s^-1\n",
+"t=1/r;//seconds\n",
+"disp(t,'time in which amplitude falls to 1/e times the initial value is ,(seconds)=')\n",
+"t2=tr;//\n",
+"disp(t2,'time in which system falls to 1/e times the initial value is ,(seconds)=')\n",
+"t3=2*(1/r);//\n",
+"disp(t3,'time in which energy falls to 1/e^4 of the initial value is,(seconds)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.6: relaxation_time_frequency_energy_and_rate_of_loss.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6 // relaxation time ,frequency ,energy ,time ,rate and number of vibrations\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"k=20;//N/m\n",
+"m=5//N-s/m\n",
+"wo=sqrt(k/m);//\n",
+"v1=2;//m/s\n",
+"to=m/v1;//seconds\n",
+"disp(to,'relaxation time is,(seconds)=')\n",
+"w=wo*(1-(1/(2*wo*to))^2);//\n",
+"lf=w/(2*%pi);//vibration/s\n",
+"disp(lf,'linear frequency is,(vibration/s)=')\n",
+"a=1;//\n",
+"e=((1/2)*m*a^2*wo^2);//joule\n",
+"disp(e,'energy is ,(joule)=')\n",
+"tm=v1*to;//seconds\n",
+"disp(tm,'time taken in fall of amlitude to 1/e value is ,(seconds)=')\n",
+"disp(tm,'time taken in fall of velocity amplitude to 1/2 value is,(seconds)=')\n",
+"tr=to;//\n",
+"disp(tr,'time taken in fall of energy to 1/e value is,(seconds)=')\n",
+"eng=(1/2)*m*a*v1^2*(2/tm);//\n",
+"disp('rate of loss of energy at t=0 seconds is '+string(eng)+' J/s and at any time is '+string(eng)+'e^-2*t/'+string(tm)+' J/s ')\n",
+"rel=((eng*2*%pi)/wo);//J/s\n",
+"disp('rate of loss of energy per cycle at t=0 seconds is '+string(rel)+' J/s and at any time is '+string(rel)+'e^-2*t/'+string(tm)+' J/s ')\n",
+"nv=tm/((2*%pi)/wo);//\n",
+"disp(nv,'number of vibratios made are,=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.7: time_and_distance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 7 // time and distance\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"b=5;//N-s/m\n",
+"v=10;//m/s\n",
+"to=b/v;//second\n",
+"disp(to,'time in which velocity falls to 1/e times the initial value is ,(second)=')\n",
+"t2=b*to;//\n",
+"disp(t2,'time in which velocit falls to half the initial value is,(second)=')\n",
+"disp('diatnce traversed by the particle before the velocity falls to half the initial value is '+string(b)+'*(1-e^-(log)'+string((2*to)/to)+')')\n",
+"x=b;//m\n",
+"disp(x,'distance traversed by the particle it comes to rest is,(m)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.8: time_interval.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 8// time interval\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"q=5*10^4;//quality factor\n",
+"x=1/10;//\n",
+"fr=300;//second^-1\n",
+"to=q/(2*%pi*fr);//second\n",
+"xm=((to*log(10)));//seconds\n",
+"disp(xm,'time interval is,(seconds)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 2.9: time.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9 // Time\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"n=240;// in sec^-1\n",
+"w=2*%pi*n;\n",
+"Q=2*10^3;\n",
+"tau=Q/w;\n",
+"t=4*tau;\n",
+"disp(t,'Time,t(s) = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/3-Forced_Harmonic_Oscillator_and_Resonance.ipynb b/Oscillations_and_Waves_by_S_Prakesh/3-Forced_Harmonic_Oscillator_and_Resonance.ipynb
new file mode 100644
index 0000000..80c6a4e
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/3-Forced_Harmonic_Oscillator_and_Resonance.ipynb
@@ -0,0 +1,196 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 3: Forced Harmonic Oscillator and Resonance"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 3.1: amlitude_and_phase_displacement.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 // Phase shift\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"F0=25;// in N\n",
+"m=1;\n",
+"f0=F0/m;\n",
+"K=1*10^3;// in N/m\n",
+"w0=sqrt(K/m);\n",
+"b=0.05;// in N-s/m\n",
+"r=b/(2*m);// in s^-1\n",
+"A=f0*10^3/sqrt(9*w0^4+(16*r^2*(w0)^2));\n",
+"disp(A,'The amplitude,A(mm) = ')\n",
+"p=2*w0;\n",
+"fi=atand(2*r*p/(w0^2-p^2));\n",
+"disp('phase shift is '+string(fi)+' degree or '+string(fi*(%pi/180))+' radian')\n",
+"//phase shift is converted wrong into radians"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 3.2: cosntant.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 // A/Amax\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"x1=[0.99;0.98;0.97];//\n",
+"wt=50;//\n",
+"wo=1;//assume\n",
+"fo=1;//assume\n",
+"for i=1:3\n",
+"    a(i)=((fo/((wo^2)*((1-x1(i)^2)^2+((1/wt^2)*x1(i)^2))^(1/2))));//\n",
+"    am(i)=fo/((wo^2)*(1/wt^2)^(1/2));//\n",
+"    z(i)=a(i)/am(i);//\n",
+"    disp('for p/wo '+string(x1(i))+' value of A/Amax is '+string(z(i))+'')\n",
+"end"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 3.3: reactance_and_impedance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // Reactance and impedence\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"n=50;// in cycles\n",
+"w=2*%pi*n;// in rad/sec\n",
+"L=1/%pi;// in H\n",
+"XL=w*L;\n",
+"disp(XL,'The reactance,XL(ohm) = ')\n",
+"R=100;// in ohm\n",
+"Z=sqrt(R^2+XL^2);\n",
+"disp(Z,'The impedence,Z(ohm) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 3.4: current_and_capacitance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 // Current and Capacity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"E=110;// in V\n",
+"R=10;// in ohm\n",
+"L=1*10^-3;// in H\n",
+"C=1*10^-6;// in F\n",
+"n=10000;// in Hz\n",
+"w=2*%pi*n;\n",
+"I=E/sqrt(R^2+((w*L)-(1/(w*C)))^2);\n",
+"disp(I,'The current ,I(A) = ')\n",
+"L1=1/(w^2*C);\n",
+"disp(L1,'The value of capacity,L1(F) = ')\n",
+"//Capacitance  is calculated wrong in the textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 3.5: resonant_frequency_separation_and_sharpness.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5 // Resonent frequency and Separation\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"L=1*10^-3;// in H\n",
+"C=0.1*10^-6;// in F\n",
+"w0=1/sqrt(L*C);\n",
+"disp(w0,'Resonant frequency,w0(rad/s)  = ')\n",
+"R=10;// in ohm\n",
+"w2_w1=R/L;\n",
+"disp(w2_w1,'the separation,(rad/s) = ')\n",
+"S=w0/w2_w1;\n",
+"disp(S,'The sharpness is = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/4-Coupled_Oscillator.ipynb b/Oscillations_and_Waves_by_S_Prakesh/4-Coupled_Oscillator.ipynb
new file mode 100644
index 0000000..0bc7d98
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/4-Coupled_Oscillator.ipynb
@@ -0,0 +1,59 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 4: Coupled Oscillator"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 4.2: ratio_of_frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 // ratio of  Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"k=1;//assume\n",
+"m1=16;//a.m.u\n",
+"m2=12;//a.m.u\n",
+"m3=m1;//\n",
+"rt=((m2+2*m1)/m2)^(1/2);//\n",
+"disp(rt,'ratio of frequency is,=')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/5-Wave_Motion_and_Speed_of_Waves_in_Gaes.ipynb b/Oscillations_and_Waves_by_S_Prakesh/5-Wave_Motion_and_Speed_of_Waves_in_Gaes.ipynb
new file mode 100644
index 0000000..b1f65c9
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/5-Wave_Motion_and_Speed_of_Waves_in_Gaes.ipynb
@@ -0,0 +1,556 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 5: Wave Motion and Speed of Waves in Gaes"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.10: wave_intensity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 10 //wave intensity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"nt=1;//watt source\n",
+"r=1;//n\n",
+"is=(nt/(4*%pi*r^2));// joule/sec-m^2\n",
+"disp(is,'intensity on the surface is ,(joule/sec-m^2)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.14: energy_flux.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 14 // Energy flux \n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"A=.10;// in m\n",
+"w=4;// in per sec\n",
+"k=0.1;// in per cm\n",
+"p=1.25*10^3;// in kg/m^3\n",
+"v=w*10^-2/k;// in m/s\n",
+"n=w/(2*%pi);\n",
+"Ef=2*%pi^2*n^2*A^2*p*v;\n",
+"disp(Ef,'Energy flux of the wave,Ef(W/m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.15: energy.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 15 // Energy radiated and energy current\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"p=1.29;// in kg/m^3\n",
+"a=.15*10^-2;// in m/s\n",
+"n=76;// in Hz\n",
+"E=2*%pi^2*n^2*a^2*p;\n",
+"disp(E,'(a). Energy radiated,E(J/m^3) = ')\n",
+"v=332;// in m/s\n",
+"Ev=E*v;\n",
+"disp(Ev,'(b). The energy  current,Ev(W/s) = ')\n",
+"// energy current is calculated wrong in the textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.16: pressure_amplitude_energy_density_and_energy_flux.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 16 // Pressure amplitude, Energy density and energy flux\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"a=10^-5;// in m\n",
+"n=500;// in per sec\n",
+"p=1.29;// in kg/m^3\n",
+"v=340;// in m/s\n",
+"Pa=2*%pi*a*n*v*p;\n",
+"disp(Pa,'(i).Pressure amplitude,Pa(N/m^2) = ')\n",
+"Ed=2*%pi^2*a^2*n^2*p;\n",
+"disp(Ed,'(ii). Energy density,Ed(J/m^3) = ')\n",
+"Ef=2*%pi^2*a^2*n^2*p*v;\n",
+"disp(Ef,'(iii). The energy flux,Ef(J/m^2-s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.17: pressure.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 17 // Pressure \n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"gama=1.4;\n",
+"u=10^-3;// in m/s\n",
+"v=340;// in m/s\n",
+"P=10^5;// in N/m^2\n",
+"p=gama*P*u/v;\n",
+"disp(p,'The pressure,p(N/m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.18: speed_of_sound.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 18 //speed\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"sa=332;//m/s\n",
+"pa=16;//density of air\n",
+"ph=1;//density of hydrogen\n",
+"vn=sa*sqrt(pa/ph);//m/s\n",
+"t1=0;//degree celsius\n",
+"t2=546;//degree celsius\n",
+"t1k=0+273;//kelvin\n",
+"t2k=t2+273;//kelvin\n",
+"v2=vn*sqrt(t2k/t1k);//m/s\n",
+"disp(vn,'speed of sound in first case is ,(m/s)=')\n",
+"disp(v2,'speed of sound in second case is,(m/s)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.19: temperature.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 19 //temperature\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"t1=0;//degree celsius\n",
+"t1k=t1+273;//kelvin\n",
+"rt=2;//\n",
+"tk=rt^2*t1k;//Kelvin\n",
+"t=tk-273;//degree celsius\n",
+"disp(t,'temperature is ,(degree-celsius)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.1: wavelength.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 // wavelength\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"v=960;// in m/s\n",
+"n=3600/60;// in per sec\n",
+"lamda=v/n;\n",
+"disp(lamda,'The wavelength,lamda(m) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.20: temperature.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 20 //temperature\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"rtd=16/14;//ratio of densities\n",
+"tk=15+273;//degree celsius\n",
+"x=(tk*rtd)-273;//degree celsius\n",
+"disp(x,'temperature is ,(degree-celsius)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.21: speed_of_sound_in_nitrogen.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 21 //speed\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"rt=4/1;//\n",
+"ss=332;//m/s\n",
+"rd=32/28;//ratio of densities\n",
+"rt1=((1+(1/rt)*rd)/(1+(1/rt)));//\n",
+"v1=ss*sqrt(rt1);//m/s\n",
+"disp(v1,'speed of sound in nitrogen is,(m/s)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.22: RMS_velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 22 //speed\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"gm=1.41;//\n",
+"vs=330;//m/s\n",
+"vrms=sqrt(3/gm)*vs;//m/s\n",
+"disp(vrms,'root mean square velocity of molecules of a gas is ,(m/s)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.2: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"c=3*10^8;// in m/s\n",
+"lamda=300;// in m\n",
+"n=c*10^-6/lamda;\n",
+"disp(n,'The frequency,n(MHz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.3: velocity_and_direction.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // velocity and direction\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//y=1.2*sin(3.5*t+0.5*x);//equation\n",
+"w=3.5;//from equation\n",
+"k=0.5;//from equation\n",
+"v=w/k;//m/s\n",
+"disp('wave velocity is '+string(v)+' m/s and direction of the wave is along negative X-axis')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.4: wave_equatio.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 //equation of wave propogation\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"amp=0.02;//m\n",
+"fr=110;//Hz\n",
+"v=330;//m/s\n",
+"w=2*%pi*fr;//s^-1\n",
+"k=w/v;//constant\n",
+"//y=a*sin(w*t-k*x);//refrence equation\n",
+"disp('equation of wave is '+string(amp)+'*sin('+string(w)+'*t-'+string(k)+'*x)')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.5: path_difference.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5 //path difference\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"v=360;//m/s\n",
+"fr=500;//Hz\n",
+"h=v/fr;//wavelength in metre\n",
+"ang=60;//degree\n",
+"angr=ang*(%pi/180);//radian\n",
+"pth=(h)/(2*%pi);//metre\n",
+"disp(pth,'path difference is ,(m)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.6: wavelength.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6 //path difference\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"pth=15;//cm\n",
+"pd=(2*%pi)/3;//radians\n",
+"h=(pth*2*%pi)/pd;//cm\n",
+"disp(h,'wavelength is,(cm)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.8: displacement_velocity_and_acceleration.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 8 //displacement ,particle velocity and acceleration\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//y=a*sin*((2*%pi)/h)*(vt-x);//\n",
+"v=1000;//cm/s\n",
+"n=25;//vibrations\n",
+"h=v/n;//cm\n",
+"a=3;//cm\n",
+"t=2;//seconds\n",
+"x1=200;//cm\n",
+"y=3*sind(((2*360)/h)*(v*t-x1));//\n",
+"vl=2*%pi*a*n;//cm/s\n",
+"acc=0;//\n",
+"disp(y,'displacement is,(cm)=')\n",
+"disp(vl,'velocity is,(cm/s)=')\n",
+"disp(acc,'acceleration is,(cm/s^2)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 5.9: amplitude_frequency_velocity_and_wavelength.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9 //amplitude,frequency,velocity ,wavelength and speed\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//y=5*sin*(4t-0.02x);//given\n",
+"a=5;//cm \n",
+"h=(2*%pi)/0.02;//\n",
+"v=0.02*10000;//cm/s\n",
+"n=v/h;//cycles/seconds\n",
+"disp(a,'amplitude is,(cm)=')\n",
+"disp(n,'frequency is,(cycles/s)=')\n",
+"disp(v,'velocity is,(cm/s)=')\n",
+"disp(h,'wavelength is,(cm)=')\n",
+"ma1x=a*4;//cm/s\n",
+"disp(ma1x,'maximum speed is,(cm/s)=')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/7-Superposition_of_Harmonic_Waves_Interference_Beats_Stationary_Waves_Phase_and_Group_Velocities.ipynb b/Oscillations_and_Waves_by_S_Prakesh/7-Superposition_of_Harmonic_Waves_Interference_Beats_Stationary_Waves_Phase_and_Group_Velocities.ipynb
new file mode 100644
index 0000000..2682395
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/7-Superposition_of_Harmonic_Waves_Interference_Beats_Stationary_Waves_Phase_and_Group_Velocities.ipynb
@@ -0,0 +1,492 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 7: Superposition of Harmonic Waves Interference Beats Stationary Waves Phase and Group Velocities"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.10: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 10 //  Frequency\n",
+"clc;\n",
+"clear;\n",
+"close\n",
+"b1=10;//beats per second\n",
+"f1=300;//Hz\n",
+"b2=15;//beats per second\n",
+"f2=325;//Hz\n",
+"n1=f1-b1;//Hz\n",
+"n2=f1+b1;//Hz\n",
+"n3=f2-b2;//Hz\n",
+"n4=f2+b2;//Hz\n",
+"disp(n2,'frequency is,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.11: velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 11 //  Velocity of sound\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"lamda1=5;// in m\n",
+"lamda2=5.5;// in m\n",
+"a=6;// beats/sec\n",
+"v=a/((lamda2-lamda1)/(lamda1*lamda2));\n",
+"disp(v,'The velocity of sound,v(m/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.12: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 12 //  Frequency\n",
+"clc;\n",
+"clear;\n",
+"close\n",
+"b1=5;//beats per second\n",
+"fr=384;//Hz\n",
+"fo=fr-b1;//Hz\n",
+"disp(fo,'frequency is,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.13: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 13 //  Frequency\n",
+"clc;\n",
+"clear;\n",
+"close\n",
+"b1=4;//beats per second\n",
+"fr=256;//Hz\n",
+"fo=fr+b1;//Hz\n",
+"disp(fo,'frequency is,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.18: frequency_wavelength_velocity_and_amlitude.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 18 //Frequency,wavelength, velocity and amplitude\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"a=6;// in cm\n",
+"lamda=10;// in cm\n",
+"T=1/10;// in sec\n",
+"disp(lamda,'Wavelength of progressive wave,(cm) = ')\n",
+"n=1/T;\n",
+"disp(n,'Frequency of progressive wave,n(per sec)')\n",
+"v=n*lamda;\n",
+"disp(v,'The velocity,v(cm/s) = ')\n",
+"disp(a,'The amplitude,a(cm) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.1: ratio.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 //  ratio\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"ri=9/16;//ratio of intensities\n",
+"ra=sqrt(ri);//ratio of amplitude\n",
+"a1=1;//assume\n",
+"a2=ra*a1;//\n",
+"rim=(a1+a2)^2/(a1-a2)^2;//\n",
+"disp('ratio of  maximum intensity and minimum intensity in fringe system is '+string(rim)+':'+string(a1)+'')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.24: group_velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 24 //Velocity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"c=3*10^8;// in m/s\n",
+"lamda1=4000;// in Angustrom\n",
+"lamda2=5000;// in Aungustrom\n",
+"mu1=1.540;\n",
+"mu2=1.530;\n",
+"vg=c*((mu1*lamda1)-(mu2*lamda2))/(mu1*mu2*(lamda1-lamda2));\n",
+"disp(vg,'The velocity,vg(m/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.25: group_velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 25 //Velocity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"v=1.8*10^8;// in m/s\n",
+"lamda=3.6*10^-7;// in m\n",
+"dv_dlamda=3.8*10^13;// in per sec\n",
+"vg=v-(lamda*dv_dlamda);\n",
+"disp(vg,'The group velocity,vg(m/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.2: intensity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 //  intensity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"I=1;//assume\n",
+"a1=1*I;//\n",
+"a2=4*I;//\n",
+"ph1=0;//degree\n",
+"i1=(a1+a2)+a2*cosd(ph1);//\n",
+"disp('intensity where phase difference is zero is '+string(i1)+'*I')\n",
+"ph2=90;//degree\n",
+"i2=(a1+a2)+a2*cosd(ph2);//\n",
+"disp('intensity where phase difference is pi/2 is '+string(i2)+'*I')\n",
+"ph3=180;//degree\n",
+"i3=(a1+a2)+a2*cosd(ph3);//\n",
+"disp('intensity where phase difference is pi is '+string(i3)+'*I')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.3: wavelength_and_frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 //  Wavelength and frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"d=30;// in cm\n",
+"lamda=2*d*10^-2;\n",
+"v=330;// in m/s\n",
+"disp(lamda,'The wavelength,(m) = ')\n",
+"n=v/lamda;\n",
+"disp(n,'The frequency,n(vibrations/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.4: time_interval.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 //  number of beats and time interval\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"n1=300;//Hz\n",
+"n2=303;//Hz\n",
+"bfs=n2-n1;//\n",
+"disp(bfs,'beat frequency per second is,=')\n",
+"ti=1/bfs;//second\n",
+"disp(ti,'time interval is,(second)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.5: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5 //  Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"n1=256;// in Hz\n",
+"x=4;// in beats per sec\n",
+"n2a=n1+x;\n",
+"n2b=n1-x;\n",
+"disp(n2a,'The frequency,n2a(Hz) = ')\n",
+"disp(n2b,'The frequency,n2b(Hz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.6: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6 //  Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"nA=256;// in Hz\n",
+"x=5;// in beats per sec\n",
+"nB=nA+x;\n",
+"disp(nB,'The frequency,nB(Hz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.7: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 7 //  Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"nB=512;// in Hz\n",
+"x=5;// in beats per sec\n",
+"nA=nB+x;\n",
+"disp(nA,'The frequency of A,nA(Hz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.8: velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 8 //  Velocity of sound\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"lamda1=1;// in m\n",
+"lamda2=1.01;// in m\n",
+"a=10/3;// in beats/sec\n",
+"v=a/((lamda2-lamda1)/(lamda1*lamda2));\n",
+"disp(v,'The velocity of sound,v(m/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.9: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9 //  Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"n=273;//\n",
+"b1=4;//beats per second\n",
+"b2=b1-1;//\n",
+"t1=15;//degree celsius\n",
+"t2=10;//degree celsius\n",
+"v1510=sqrt((n+t1)/(n+t2));//\n",
+"n=((b2*v1510-b1)/(1-v1510));//\n",
+"disp(n,'frequency is,(Hz)=')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/8-Vibrations_of_Strings_and_Membranes.ipynb b/Oscillations_and_Waves_by_S_Prakesh/8-Vibrations_of_Strings_and_Membranes.ipynb
new file mode 100644
index 0000000..0d31642
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/8-Vibrations_of_Strings_and_Membranes.ipynb
@@ -0,0 +1,506 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 8: Vibrations of Strings and Membranes"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.10: velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 10// velocity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"l1=20;//cm\n",
+"v1=600;//cm^-1\n",
+"n1=v1/4;//\n",
+"v1=2*n1*l1*10^-2;//m/sec\n",
+"v2=sqrt(2)*v1;//m/s\n",
+"disp(v1,'velocity of the waves is,(m/s)=')\n",
+"disp(round(v2),'velocity of waves when tension of the string is doubled is,(m/s)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.11: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 11// frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"nb=6;//beats\n",
+"l1=20;//cm\n",
+"l2=21;//cm\n",
+"x=l2/l1;//\n",
+"n=(x*nb+nb)/(x-1);//\n",
+"disp(n,'frequency is,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.12: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 12// frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"nb=4;//beats\n",
+"l1=70;//cm\n",
+"l2=70-1;//cm\n",
+"x=l2/l1;//\n",
+"n=(x*nb)/(1-x);//\n",
+"disp(n,'frequency is,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.13: length.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 13// length\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"n123=1/3/15;//\n",
+"tl=105;//cm\n",
+"l123=15/5/1;//\n",
+"k=tl/21;//\n",
+"l1=15*k;//cm\n",
+"l2=5*k;//cm\n",
+"l3=k;//cm\n",
+"disp(l1,'l1 length is,(cm)=')\n",
+"disp(l2,'l2 length is,(cm)=')\n",
+"disp(l3,'l3 length is,(cm)=')\n",
+"//length l2 is calculated wrong in the textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.14: wavelength.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 14// wave-length\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//y=ym*sin*2*%pi(nt-(x/h));//given\n",
+"disp('wavelength is (%pi*ym)/2')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.15: FREQUENCY.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 15// frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"l=2.5;//m\n",
+"m1=0.001;//kg\n",
+"tn=4;//N\n",
+"m=m1/l;//kg/m\n",
+"n=((1/(2*l))*sqrt(tn/m));//Hz\n",
+"disp(n,'frequency is ,(Hz)=')\n",
+"disp('frequencies stopped are '+string(5*n)+' Hz,'+string(10*n)+' Hz,'+string(15*n)+' Hz')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.16: frequency_and_relative_amplitude.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 16// frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"l=1;//m\n",
+"m1=0.5;//kg\n",
+"tn=200;//N\n",
+"m=m1/l;//kg/m\n",
+"n=((1/(2*l))*sqrt(tn/m));//Hz\n",
+"disp(n,'frequency is ,(Hz)=')\n",
+"w=2*%pi*n;//\n",
+"disp('ratio of three frequencies is '+string(w)+' : '+string(2*w)+' : '+string(3*w)+'')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.1: speed.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 // Speed\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"m1=0.1;// in kg\n",
+"g=9.81;// in m/s^2\n",
+"T=m1*g;// N\n",
+"A=10^-6;// in m^2\n",
+"p=9.81*10^3;// in kg/m^3\n",
+"m=A*p;// in kg/m\n",
+"v=sqrt(T/m);\n",
+"disp(v,'The speed of transverse waves,v(m/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.2: tensile_stress.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2 // tensile stress\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"p=8000;// in kg/m^3\n",
+"v=340;// in m/s\n",
+"TbyA=v^2*p*10^-2;\n",
+"disp(TbyA,'Tensile stress,(N/m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.3: tension.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3 // Tension\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"M=2*10^-3;// in kg\n",
+"l=35*10^-2;// in m\n",
+"n=500;// in Hz\n",
+"m=M/l;// in kg/m\n",
+"T=4*n^2*l^2*m;\n",
+"disp(T,'Tension,T(N) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.4: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"T=625;// in N\n",
+"T1=100;// in N\n",
+"l=1/2;\n",
+"n=240;// in Hz\n",
+"n1=1/l*(sqrt(T1/T))*n;\n",
+"disp(n1,'The frequency,n1(Hz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.5: initial_tension.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5 // initial tension\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"rt=2/3;//ratio\n",
+"mi=5;//kg wt\n",
+"M=((1/rt)^2)-1;//\n",
+"mo=mi/M;//kg wt\n",
+"disp(mo,'initial tension in string is ,(kg-wt)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.6: speed_stress_and_percentage_change.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6// speed,stress and change in frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"n=175;//Hz\n",
+"l=1.5;//m\n",
+"v=2*n*l;//m/s\n",
+"d=7.8*10^3;//kg/m^3\n",
+"st=v^2*d;//N/m^2\n",
+"per=3;//% increament\n",
+"T=1;//assume\n",
+"td=(1+per/100)*T;//\n",
+"x=(((1/2)*(per/100)));//\n",
+"td=x*100;//\n",
+"disp(v,'velocity is,(m/s)=')\n",
+"disp(st,'stress is,(N/m^2)=')\n",
+"disp(td,'percentage change in frequency is,(%)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.7: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 7 // Frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"l=.50;// in m\n",
+"m1=25;// in kg\n",
+"m2=1.44*10^-3;// in kg\n",
+"g=9.81;// in m/s^2\n",
+"T=m1*g;\n",
+"m=m2/l;\n",
+"p=2;\n",
+"n=(p/(2*l))*sqrt(T/m);\n",
+"disp(n,'The frequency,n = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.8: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 8// frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"l1=90;//cm\n",
+"d1=0.05;//cm\n",
+"d2=0.0625;//cm\n",
+"l2=60;//cm\n",
+"n1=200;//Hz\n",
+"n2=((l1*d1*n1)/(l2*d2));//Hz\n",
+"disp(n2,'frequency is,(Hz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.9: tension.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9// tension\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"n21=3/2;//\n",
+"r21=3/4;//\n",
+"t1=2.048;//kg. wt\n",
+"t2=(n21*r21)^2*t1;//kg weight\n",
+"n31=9/4;//\n",
+"r31=2/4;//\n",
+"t3=(n31*r31)^2*t1;//kg-weight\n",
+"n41=27/8;//\n",
+"r41=1/4;//\n",
+"t4=(n41*r41)^2*t1;//kg-weight\n",
+"disp(t2,'tension (T2) is ,(kg weight)=')\n",
+"disp(t3,'tension (T3) is ,(kg weight)=')\n",
+"disp(t4,'tension (T4) is ,(kg weight)=')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}
diff --git a/Oscillations_and_Waves_by_S_Prakesh/9-Longitudinal_Acoustic_Waves_in_Air.ipynb b/Oscillations_and_Waves_by_S_Prakesh/9-Longitudinal_Acoustic_Waves_in_Air.ipynb
new file mode 100644
index 0000000..edfaf37
--- /dev/null
+++ b/Oscillations_and_Waves_by_S_Prakesh/9-Longitudinal_Acoustic_Waves_in_Air.ipynb
@@ -0,0 +1,422 @@
+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 9: Longitudinal Acoustic Waves in Air"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.10: length.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 10// length\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"l1=66;//cm\n",
+"v=330;//m/s\n",
+"nbs=5;//beats/sec\n",
+"x=(2*(v-(nbs*2*l1*10^-2))/(v*2*l1*10^-2));//\n",
+"l2=1/x;//cm\n",
+"disp(l2*100,'length is,(cm)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.11: fundamental_frequency_and_length.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 11// length\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"f=110;//Hz\n",
+"v=330;//m/s\n",
+"l=v/(2*f);//m\n",
+"disp(f,'fundamental frequency is,(Hz)=')\n",
+"disp(l,'length is ,(m)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.12: wave_equation_frequency_amplitude_wavelength_and_distance.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 12// equation,frequency,amplitude ,wavelength and distance\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//y=6*(sin(2*%pi*x)/6)*cos(160*%pi*t);//given equation\n",
+"a=3;//cm\n",
+"T=(2*%pi)/(160*%pi);//sec\n",
+"h=((2*%pi*6)/(2*%pi));//cm\n",
+"disp('wave equation is 3*sin((160*%pi*t)+(2*%pi*x)/6)')\n",
+"disp(a,'amplitude is ,(cm)=')\n",
+"disp(1/T,'frequency is ,(Hz)=')\n",
+"disp(h,'wavelength is,(cm)=')\n",
+"db=h/2;//\n",
+"disp(db,'distance between consecutive antinodes is,(cm)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.13: length_pressure_amplitude.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 13// length,amlitude,pressure\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"f=440;//Hz\n",
+"v=330;//m/s\n",
+"l=((5*v)/(4*f))*100;//cm\n",
+"disp(l,'length (L) is ,(cm)=')\n",
+"ang=cos((2*%pi)/8);//\n",
+"disp('maximum pressure variation is at node = ΔPo*'+string(ang)+' and minimum at antinode =0')\n",
+"pmax=0;//\n",
+"pmin=0;//\n",
+"disp('at antinode pressure variation is Pmax= '+string(pmax)+' and Pmin= '+string(pmin)+'')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.1: pressure_amplitude_energy_density_and_energy_lux.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1 // Pressure amplitude, Energy density and Energy flux\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"A=1*10^-5;// in m\n",
+"n=500;// in per sec\n",
+"v=340;// in m/s\n",
+"p=1.29;// in kg/m^3\n",
+"Pa=2*%pi*n*v*p*A;\n",
+"disp(Pa,'Pressure amplitude,Pa(N/m^2) = ')\n",
+"Ed=2*%pi^2*n^2*p*A^2;\n",
+"disp(Ed,'Energy density,Ed(J/m^3) = ')\n",
+"Ev=Ed*v;\n",
+"disp(Ev,'Energy flux,Ev(J/m^2-s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.2: pressure.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2// Pressure \n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"gama=1.4;\n",
+"u=10^-3;// in m/s\n",
+"v=340;// in m/s\n",
+"P=10^5;// in N/m^2\n",
+"p=gama*P*u/v;\n",
+"disp(p,'The pressure,p(N/m^2) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.3: amplitude.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3// The amplitude \n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"n=350;// in Hz\n",
+"v=330;// in m/s\n",
+"p=1.293;// in kg/m^3\n",
+"I=1*10^-6;// in W/m^2\n",
+"A=sqrt(I/(2*%pi*n^2*p*v));\n",
+"disp(A,'The amplitude of wave,A(m) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.4: velocity_wavelength_and_amplitude.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 4// Velocity, Amplitude of pressure and particle velocity amplitude\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"gama=1.4;\n",
+"P=1.013*10^5;\n",
+"p1=1.29;// in kg/m^3\n",
+"A=2.5*10^-7;// in m\n",
+"v=sqrt(gama*P/p1);\n",
+"disp(v,'The velocity,v(m/s) = ')\n",
+"n=1000;// in Hz\n",
+"lamda=v/n;\n",
+"disp(lamda,'Wavelength,lamda(m) = ')\n",
+"p=p1*v*2*%pi*n*A;\n",
+"disp(p,'Amplitude of pressure,p(N/m^2) = ')\n",
+"u=2*%pi*n*A;\n",
+"disp(u,'Particle velocity amplitude,u(m/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.5: BULK_MODULUS_AMPLITUDE_AND_PRESSURE_VARIATION.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 5// Amplitude\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"v=(1/3)*10^3;// in m/s\n",
+"p=1.25;// in kg/m^3\n",
+"E=v^2*p;\n",
+"n=10^4;// in rad/sec\n",
+"disp(E,'Bulk modulus of medium,E(N/m^2) = ')\n",
+"I=10^-12;// in W/m^2\n",
+"A=sqrt(I/(2*%pi^2*n^2*p*v));\n",
+"disp(A,'Amplitude of wave,A(m ) = ')\n",
+"P=sqrt(2*I*p*v);\n",
+"disp(P,'Pressure amplitude,P(N/m^2) = ')\n",
+"// answer A and E is wrong in textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.6: velocity.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 6// Root mean squre velocity\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"vs=330;// in m/s\n",
+"gama=1.41;\n",
+"c=round(sqrt(3/gama)*vs);\n",
+"disp(c,'The root mean square velocity of modulus,c(m/s) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.7: power.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 7// Acoustic power entering\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"A=1*2;// in m^2\n",
+"a=80;// in dB\n",
+"I0=10^-12;// in W/m^2\n",
+"IbyI0=10^(80/10);\n",
+"I=I0*IbyI0;\n",
+"Ape=I*A;\n",
+"disp(Ape,'Acoustic power entering the room,(Watt) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.8: intensity_level.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 8// Acoustic intensity level\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"Pr=3;// in W\n",
+"r=15;// in m\n",
+"I=Pr/(4*%pi*r^2);// in W/m^2\n",
+"I0=10^-12;// in W/m^2\n",
+"L=round(10*log10(I/I0));\n",
+"disp(L,'Acoustic intensity level,L(dB) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.9: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9// frequency\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"n2=200;//second^-1\n",
+"l21=2;//\n",
+"f=l21*n2;//\n",
+"disp(f,'frequency is,(second^-1)=')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}