Added(A)/Deleted(D) following books

 A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter10_EAg6827.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter10_FWFi3lU.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter10_Goix5H9.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter10_VriTfiQ.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter10_Yq1Psz2.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter10_l9H0tzb.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter10_pYSKzNA.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter10_zs7Ebyd.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter11_27AWa1S.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter11_47129pd.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter11_CGVC5S7.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter11_aM6HbOJ.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter11_elTomjM.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter11_hIH40hA.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter11_hfcwfMy.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter11_rDaXznv.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter12_4CIoGBj.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter12_8Ha6SRC.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter12_BV4qq7W.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter12_DcqNS3a.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter12_GaxQomY.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter12_TWDQmEU.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter12_gYL8x2U.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter12_pwlIEac.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter1_9Ph1wQl.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter1_H4ZXqG6.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter1_R7vvA9U.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter1_RJFpm9n.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter1_hdpf5pv.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter1_s7mmHTE.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter1_svi606z.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter1_yZrBrGW.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter2_1u2hkaL.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter2_4iVYyIH.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter2_96qogp8.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter2_97bKbrn.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter2_KU6DQxX.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter2_WQAFWBB.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter2_kXmkQiI.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter2_rMDgBlb.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter3_0Gpo8ij.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter3_1HFLVW3.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter3_Kef4wQi.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter3_MWqVgIK.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter3_QiNYdnt.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter3_ZOEnqWz.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter3_t8ZxgMJ.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter3_yX7jRTL.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter4_12jIRAa.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter4_7TlydJM.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter4_9F6nz40.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter4_Iv6UqxF.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter4_QznuUog.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter4_Tlme4Nt.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter4_kKbunDz.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter4_kj2kQSj.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter5_ELZ4gfb.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter5_HmzPXBx.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter5_NsyjFuf.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter5_dQcqRqy.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter5_fpjVXLa.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter5_qEtyNEB.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter5_wOjIeEX.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter5_zpdMjKp.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter6_4sTMSct.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter6_OaXeXza.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter6_OzarWlo.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter6_ZcykI2A.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter6_Ztedvce.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter6_hp8AaKa.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter6_j1y0oTK.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter6_srj5dHs.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter7_7s2tMTN.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter7_9XJ7DgO.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter7_Kxvh43O.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter7_St5Khwo.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter7_XgCkEpd.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter7_YxJXxam.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter7_cYbOBPv.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter7_wdE8t89.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter8_3OxJHIx.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter8_Bj4FcI7.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter8_GBeiA21.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter8_QSOQgt9.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter8_lwCA1i3.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter8_m8vzt2q.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter8_pYLCIKK.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/Chapter8_yBBd5FI.ipynb
A  BSc_First_Year_Physics_by_P._BalaBhaskar,_N._Srinivasa_Rao,_B._Sanjeeva_Rao/screenshots/11.png
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter10_uTyvarI.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter11_j1rU3Z4.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter12_MsiPuok.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter13_Nvp3wKs.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter14_EldnQKR.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter1_wnjphci.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter2_MymLk0N.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter3_rTdfw6Q.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter4_OPOooLb.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter5_YkzzeVY.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter6_wKefPQQ.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/Chapter8_B0hDPyA.ipynb
A  Solid_State_Physics_by_Dr._M._Arumugam/screenshots/22_X7ip5yw.png
A  Solid_State_Physics_by_Dr._M._Arumugam/screenshots/33_mVM81ix.png
A  Solid_State_Physics_by_Dr._M._Arumugam/screenshots/44_gepd6Lu.png
A  sample_notebooks/nitinkumar/Chapter2.ipynb

1 files changed, 319 insertions, 0 deletions

diff --git a/Solid_State_Physics_by_Dr._M._Arumugam/Chapter2_MymLk0N.ipynb b/Solid_State_Physics_by_Dr._M._Arumugam/Chapter2_MymLk0N.ipynb
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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# 2: Crystallography and Crystal Structures"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 2, Page number 2.21"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "spacing between (100) plane is 5.64 angstrom\n",
+      "spacing between (110) plane is 3.99 angstrom\n",
+      "answer for spacing between (110) plane given in the book is wrong\n",
+      "spacing between (111) plane is 3.26 angstrom\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "a=5.64;      #lattice constant(angstrom)\n",
+    "h1=1;\n",
+    "k1=0;\n",
+    "l1=0;\n",
+    "h2=1;\n",
+    "k2=1;\n",
+    "l2=0;\n",
+    "h3=1;\n",
+    "k3=1;\n",
+    "l3=1;\n",
+    "\n",
+    "#Calculation\n",
+    "d100=a/math.sqrt(h1**2+k1**2+l1**2);     #spacing between (100) plane\n",
+    "d110=a/math.sqrt(h2**2+k2**2+l2**2);     #spacing between (110) plane\n",
+    "d111=a/math.sqrt(h3**2+k3**2+l3**2);     #spacing between (111) plane\n",
+    "\n",
+    "#Result\n",
+    "print \"spacing between (100) plane is\",d100,\"angstrom\"\n",
+    "print \"spacing between (110) plane is\",round(d110,2),\"angstrom\"\n",
+    "print \"answer for spacing between (110) plane given in the book is wrong\"\n",
+    "print \"spacing between (111) plane is\",round(d111,2),\"angstrom\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 3, Page number 2.22"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "number of atoms in (100) is 1.535 *10**13 atoms/mm**2\n",
+      "number of atoms in (110) is 1.085 *10**13 atoms/mm**2\n",
+      "number of atoms in (111) is 1.772 *10**13 atoms/mm**2\n",
+      "answers given in the book vary due to rounding off errors\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "a=3.61*10**-7;        #lattice constant(mm)\n",
+    "\n",
+    "#Calculation\n",
+    "A100=a**2;     #surface area(mm**2)\n",
+    "n=1+(4*(1/4));\n",
+    "N1=n/A100;      #number of atoms in (100)(per mm**2)\n",
+    "A110=math.sqrt(2)*a**2;      #surface area(mm**2)\n",
+    "N2=n/A110;      #number of atoms in (110)(per mm**2)\n",
+    "A111=math.sqrt(3)*a**2/2;    #surface area(mm**2)\n",
+    "N3=n/A111;     #number of atoms in (110)(per mm**2)\n",
+    "\n",
+    "#Result\n",
+    "print \"number of atoms in (100) is\",round(N1/10**13,3),\"*10**13 atoms/mm**2\"\n",
+    "print \"number of atoms in (110) is\",round(N2/10**13,3),\"*10**13 atoms/mm**2\"\n",
+    "print \"number of atoms in (111) is\",round(N3/10**13,3),\"*10**13 atoms/mm**2\"\n",
+    "print \"answers given in the book vary due to rounding off errors\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 4, Page number 2.23"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "wavelength of x rays is 1.552 angstrom\n",
+      "answer varies due to rounding off errors\n",
+      "energy of x rays is 8 *10**3 eV\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "n=4;      \n",
+    "A=107.87;    #atomic weight\n",
+    "rho=10500;     #density(kg/m**3)\n",
+    "N=6.02*10**26;    #number of molecules\n",
+    "theta=19+(12/60);   #angle(degrees)\n",
+    "h=1;\n",
+    "k=1;\n",
+    "l=1;\n",
+    "h0=6.625*10**-34;     #planck constant\n",
+    "c=3*10**8;     #velocity of light(m/s)\n",
+    "e=1.6*10**-19;   #charge(coulomb)\n",
+    "\n",
+    "#Calculation\n",
+    "theta=theta*math.pi/180;     #angle(radian)\n",
+    "a=(n*A/(N*rho))**(1/3);\n",
+    "d=a*10**10/math.sqrt(h**2+k**2+l**2);      \n",
+    "lamda=2*d*math.sin(theta);     #wavelength of x rays(angstrom)\n",
+    "E=h0*c/(lamda*10**-10*e);      #energy of x rays(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"wavelength of x rays is\",round(lamda,3),\"angstrom\"\n",
+    "print \"answer varies due to rounding off errors\"\n",
+    "print \"energy of x rays is\",int(E/10**3),\"*10**3 eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 5, Page number 2.23"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "density is 2332 kg/m**3\n",
+      "answer varies due to rounding off errors\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "n=8;    #number of atoms\n",
+    "r=2.351*10**-10;     #bond length(angstrom)\n",
+    "A=28.09;                #Atomic wt. of NaCl\n",
+    "N=6.02*10**26           #Avagadro number\n",
+    "\n",
+    "#Calculation\n",
+    "a=4*r/math.sqrt(3);     \n",
+    "rho=n*A/(N*a**3);     #density(kg/m**3)\n",
+    "\n",
+    "#Result\n",
+    "print \"density is\",int(rho),\"kg/m**3\"\n",
+    "print \"answer varies due to rounding off errors\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 6, Page number 2.24"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "radius of largest sphere is 0.1547 r\n",
+      "maximum radius of sphere is 0.414 r\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "from sympy import Symbol\n",
+    "\n",
+    "#Variable declaration\n",
+    "r=Symbol('r')\n",
+    "\n",
+    "#Calculation\n",
+    "a1=4*r/math.sqrt(3);\n",
+    "R1=(a1/2)-r;           #radius of largest sphere\n",
+    "a2=4*r/math.sqrt(2);\n",
+    "R2=(a2/2)-r;       #maximum radius of sphere\n",
+    "\n",
+    "#Result\n",
+    "print \"radius of largest sphere is\",round(R1/r,4),\"r\"\n",
+    "print \"maximum radius of sphere is\",round(R2/r,3),\"r\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 7, Page number 2.25"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "percent volume change is 0.5 %\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "r1=1.258*10**-10;     #radius(m)\n",
+    "r2=1.292*10**-10;     #radius(m)\n",
+    "\n",
+    "#Calculation\n",
+    "a_bcc=4*r1/math.sqrt(3);\n",
+    "v=a_bcc**3;\n",
+    "V1=v/2;\n",
+    "a_fcc=2*math.sqrt(2)*r2;\n",
+    "V2=a_fcc**3/4;\n",
+    "V=(V1-V2)*100/V1;           #percent volume change is\",V,\"%\"\n",
+    "\n",
+    "#Result\n",
+    "print \"percent volume change is\",round(V,1),\"%\""
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}