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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:247cbf7511831aaf13adbf586a5a4c7c4e491e38e060a5558f6021f692906cbf"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter17-The Band Theory of Solids"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg522"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 17.1\n",
+      "##calculation of probability\n",
+      "\n",
+      "##given values\n",
+      "E=.01;##energy difference in eV\n",
+      "kT=.026;##temperture equivalent at room temp in e\n",
+      "\n",
+      "##calculation\n",
+      "P=1/(1+(math.e**(E/kT)));\n",
+      "\n",
+      "print'%s %.2f %s'%('interatomic spacing  is',P,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "interatomic spacing  is 0.41 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2-pg523"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 17.2\n",
+      "##calculation of velocity of e\n",
+      "\n",
+      "##given values\n",
+      "e=1.6*10**-19.;##charge of e in C\n",
+      "E=2.1*e;##fermi level in J\n",
+      "m=9.1*10**-31.;##mass of e in kg\n",
+      "\n",
+      "##calculation\n",
+      "v=math.sqrt(2.*E/m);\n",
+      "\n",
+      "print'%s %.2f %s'%('velocity of e(in m/s)',v,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "velocity of e(in m/s) 859337.85 \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex3-pg523"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 17.3\n",
+      "##calculation of velocity of fraction of free electrons\n",
+      "\n",
+      "##given values\n",
+      "E=5.5;##fermi level in eV\n",
+      "kT=.026;##temperture equivalent at room temp in e\n",
+      "\n",
+      "##calculation\n",
+      "f=2.*kT/E;\n",
+      "\n",
+      "print'%s %.4f %s'%('fraction of free electrone\\s upto width kT on either side of Ef is',f,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "fraction of free electrone\\s upto width kT on either side of Ef is 0.0095 \n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file