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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:df9996e09d849b24524dd415b626cbe4279b4acdbe25d68bb407e2d42467c7a7"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "11: Lattice dynamics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 11.1, Page number 238"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "h=6.626*10**-34;    #planck's constant(Js)\n",
+      "k=1.38*10**-23;   #boltzmann constant(J/K)\n",
+      "thetaD=350;    #temperature for Cu(K)\n",
+      "theetaD=550;   #temperature for Si(K)\n",
+      "\n",
+      "#Calculation\n",
+      "newDCu=k*thetaD/h;   #highest possible frequency for Cu(per sec)\n",
+      "newDSi=k*theetaD/h;  #highest possible frequency for Si(per sec)\n",
+      "\n",
+      "#Result\n",
+      "print \"highest possible frequency for Cu is\",round(newDCu/10**11,3),\"*10**11 per sec\"\n",
+      "print \"highest possible frequency for Si is\",round(newDSi/10**11,2),\"*10**11 per sec\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "highest possible frequency for Cu is 72.895 *10**11 per sec\n",
+        "highest possible frequency for Si is 114.55 *10**11 per sec\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 11.2, Page number 238"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "h=6.626*10**-34;    #planck's constant(Js)\n",
+      "k=1.38*10**-23;   #boltzmann constant(J/K)\n",
+      "N=6.02*10**26;   #avagadro number(k/mole)\n",
+      "T=10;   #temperature(K)\n",
+      "thetaD=105;   #debye temperature(K)\n",
+      "\n",
+      "#Calculation\n",
+      "C=(12/5)*(math.pi**4)*N*k*(T/thetaD)**3;   #specific heat of lead(J/K kmol)\n",
+      "newD=k*thetaD/h;    #highest frequency(per sec)\n",
+      "\n",
+      "#Result\n",
+      "print \"specific heat of lead is\",round(C,1),\"J/K kmol\"\n",
+      "print \"answer varies due to rounding off errors\"\n",
+      "print \"highest frequency is\",round(newD/10**11,2),\"*10**11 per sec\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "specific heat of lead is 1677.7 J/K kmol\n",
+        "answer varies due to rounding off errors\n",
+        "highest frequency is 21.87 *10**11 per sec\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file