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

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diff --git a/Solid_State_Physics_by_Dr._M._Arumugam/Chapter3_rTdfw6Q.ipynb b/Solid_State_Physics_by_Dr._M._Arumugam/Chapter3_rTdfw6Q.ipynb
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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# 3: X-Ray Diffraction"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 1, Page number 3.9"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "maximum order of diffraction is 1.53\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "d=1.181;       #lattice spacing(angstrom)\n",
+    "theta=90*math.pi/180;     #glancing angle(radian)\n",
+    "lamda=1.540;    #wavelength of X-rays(angstrom)\n",
+    "\n",
+    "#Calculation\n",
+    "n=2*d*math.sin(theta)/lamda;       #maximum order of diffraction \n",
+    "\n",
+    "#Result\n",
+    "print \"maximum order of diffraction is\",round(n,2)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 2, Page number 3.9"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "cube edge of unit cell is 3.514 angstrom\n",
+      "answer given in the book varies due to rounding off errors\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "n=1;     #order\n",
+    "theta=9.5*math.pi/180;     #glancing angle(radian)\n",
+    "lamda=0.58;                 #wavelength(angstrom)\n",
+    "h=2;\n",
+    "k=0;\n",
+    "l=0;\n",
+    "\n",
+    "#Calculation\n",
+    "d=n*lamda/(2*math.sin(theta));       #lattice parameter(angstrom)\n",
+    "a=d*math.sqrt(h**2+k**2+l**2);       #cube edge of unit cell(angstrom)\n",
+    "\n",
+    "#Result\n",
+    "print \"cube edge of unit cell is\",round(a,3),\"angstrom\"\n",
+    "print \"answer given in the book varies due to rounding off errors\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 3, Page number 3.10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "glancing angle for 3rd order is 26 degrees 35 minutes\n",
+      "answer for minutes given in the book is wrong\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "theta=(8+(35/60))*math.pi/180;     #glancing angle(radian)\n",
+    "lamda=0.842;   #wavelength of X-rays(angstrom)\n",
+    "n1=1;                  #order\n",
+    "n3=3;                  #order \n",
+    "\n",
+    "#Calculation\n",
+    "theta3=math.asin(n3*lamda*math.sin(theta)/(n1*lamda))*180/math.pi;    #glancing angle for 3rd order(degrees)\n",
+    "theta3d=int(theta3);                             #glancing angle for 3rd order(degrees)  \n",
+    "theta3m=(theta3-theta3d)*60;                     #glancing angle for 3rd order(minutes)\n",
+    "\n",
+    "#Result\n",
+    "print \"glancing angle for 3rd order is\",theta3d,\"degrees\",int(theta3m),\"minutes\"\n",
+    "print \"answer for minutes given in the book is wrong\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 4, Page number 3.10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "interplanar spacing is 2.22 angstrom\n",
+      "value of h**2+k**2+l**2 is 2\n",
+      "miller indices are (110) or (011) or (101)\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "theta=20.3*math.pi/180;     #glancing angle(radian)\n",
+    "lamda=1.54;   #wavelength of X-rays(angstrom)\n",
+    "n=1;          #order\n",
+    "a=3.16;       #lattice parameter(angstrom)\n",
+    "\n",
+    "#Calculation\n",
+    "d=n*lamda/(2*math.sin(theta));       #interplanar spacing(angstrom)\n",
+    "x=(a/d)**2;        #assume x=(h**2+k**2+l**2)\n",
+    "\n",
+    "#Result\n",
+    "print \"interplanar spacing is\",round(d,2),\"angstrom\"\n",
+    "print \"value of h**2+k**2+l**2 is\",int(x)\n",
+    "print \"miller indices are (110) or (011) or (101)\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 5, Page number 3.11"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "wavelength is 1.553 angstrom\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;     #order\n",
+    "A=107.87;     #atomic weight(kg)\n",
+    "theta=(19+(12/60))*math.pi/180;     #glancing angle(radian)\n",
+    "h=1;\n",
+    "k=1;\n",
+    "l=1;\n",
+    "N=6.02*10**26;          #avagadro number\n",
+    "rho=10500;              #density(kg/m**3)\n",
+    "H=6.625*10**-34;        #plancks constant(Js)\n",
+    "c=3*10**8;              #velocity of light(m/s)\n",
+    "e=1.6*10**-19;          #charge(coulomb)\n",
+    "\n",
+    "#Calculation\n",
+    "a=round(((n*A/(N*rho))**(1/3))*10**10,2);   #lattice parameter(angstrom)\n",
+    "d=a/math.sqrt((h**2)+(k**2)+(l**2));     #lattice parameter(angstrom)\n",
+    "lamda=2*d*math.sin(theta);         #wavelength(angstrom)\n",
+    "E=H*c/(lamda*10**-10*e);                   #energy of X-rays(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"wavelength is\",round(lamda,3),\"angstrom\"\n",
+    "print \"energy of X-rays is\",int(round(E/10**3)),\"*10**3 eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 6, Page number 3.12"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 22,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "specimen distance is 7.559 cm\n",
+      "answer given in the book varies due to rounding off errors\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "h=1;\n",
+    "k=1;\n",
+    "l=1;\n",
+    "a=4.57;   #lattice parameter(angstrom)\n",
+    "lamda=1.52;         #wavelength(angstrom)\n",
+    "r=5;        #radius(cm)\n",
+    "\n",
+    "#Calculation\n",
+    "d=a/math.sqrt(h**2+k**2+l**2);     #lattice parameter(angstrom)\n",
+    "theta=math.asin(lamda/(2*d));      #glancing angle(degrees)\n",
+    "X=r/math.tan(2*theta);             #specimen distance(cm)\n",
+    "\n",
+    "#Result\n",
+    "print \"specimen distance is\",round(X,3),\"cm\"\n",
+    "print \"answer given in the book varies due to rounding off errors\""
+   ]
+  }
+ ],
+ "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
+}