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diff --git a/Modern_physics_for_engineers_by_S.P.Taneja/chapter20.ipynb b/Modern_physics_for_engineers_by_S.P.Taneja/chapter20.ipynb
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+++ b/Modern_physics_for_engineers_by_S.P.Taneja/chapter20.ipynb
@@ -0,0 +1,136 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:28632a8e2e8b8cfc35d61b358e115b3b420083bd7c5c7f588f01ea1f5ef49276"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 20 Free electron theory"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 20.1 Page no 191"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "a=0.971*10**3               #Kg/m**3\n",
+      "w=22.99\n",
+      "N0=6*10**26\n",
+      "m=9.1*10**-31                #Kg\n",
+      "h=6.626*10**-34                 #J-s\n",
+      "\n",
+      "#Calculation\n",
+      "import math\n",
+      "N=(N0*a)/w\n",
+      "Ef=(h/(8*m))*((3*N)/math.pi)**0.66\n",
+      "\n",
+      "#Result\n",
+      "print\"Fermi energy is\", round(Ef*10**-14,0)*10**-19,\"J\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Fermi energy is 5e-19 J\n"
+       ]
+      }
+     ],
+     "prompt_number": 12
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 20.2 Page no 192"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "a=10**-10                 #m\n",
+      "m=9.1*10**-31               #Kg\n",
+      "h=6.626*10**-34                #J-s\n",
+      "\n",
+      "#Calculation\n",
+      "E=3*h**2/(8*m*a**2)\n",
+      "\n",
+      "#Result\n",
+      "print\"Energy difference is\", round(E*10**17,3)*10**-17,\"J\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Energy difference is 1.809e-17 J\n"
+       ]
+      }
+     ],
+     "prompt_number": 18
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 20.3 Page no 192"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "x=1.39\n",
+      "K=0.025\n",
+      "Ef=3.2\n",
+      "\n",
+      "#Calculation\n",
+      "E=x*K\n",
+      "E1=E+Ef\n",
+      "\n",
+      "#Result\n",
+      "print\"Energy at 300 K is\", round(E1,3),\"ev\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Energy at 300 K is 3.235 ev\n"
+       ]
+      }
+     ],
+     "prompt_number": 23
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file