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+{
+ "metadata": {
+  "name": "Chapter_5_Kittel"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": "Chapter 5 : Phonons and Lattice Vibrations\n"
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "Example 1: Generation of phonons, Page 137"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "# importing modules\nfrom __future__ import division\nimport math\n\n# Variable declaration\n\nl = 4 * 10**(-5);  # the wavelength in cm for visible light -4000 Angstrom\nVs = 5 * 10**(5);  # velocity of sound in  cm/sec\nn = 1.5 ;          # refractive index of the crystal\n\nNu = (2*Vs*2*3.14*n)/(l);    # Nu = [2Vs(2*3.14)*n/l]*sin(psi/2)  and here sin(psi/2)=1\n\n#Result\n\nprint \" The maximum phonon frequency is \", Nu , \" per sec\"\n\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " The maximum phonon frequency is  2.355e+11  per sec\n"
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "",
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file