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diff --git a/Engineering_Physics_by_Uma_Mukherji/Chapter3.ipynb b/Engineering_Physics_by_Uma_Mukherji/Chapter3.ipynb
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@@ -0,0 +1,112 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:5501457babf7cd881ef81ebc39845c677f30b7398a16e9160a7f32cf8c277a73"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "3: Thermionic Emission"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 3.1, Page number 67"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "S=2*10**-6;      #tungsten filament(m**2)\n",
+      "T=2000;      #temperature(K)\n",
+      "A=60.2*10**4;   #value of A(amp/m**2 K)     \n",
+      "b=52400;       #value of b \n",
+      "e=1.6*10**-19;   #electron charge(c)\n",
+      "\n",
+      "#Calculation\n",
+      "I=A*S*(T**2)*(math.exp(-(b/T)));   #electronic emission current(amp)\n",
+      "J=A*(T**2)*(math.exp(-b/T));      #emission current density(A/m**2)\n",
+      "no=J/e;          #no. of electrons emitted per unit area per sec(per m**2 sec)\n",
+      "\n",
+      "#Result\n",
+      "print \"maximum obtainable electronic emission current is\",round(I*10**6,3),\"micro amp\"\n",
+      "print \"emission current density is\",round(J,5),\"A/m**2\"\n",
+      "print \"no. of electrons emitted per unit area per sec is\",round(no/10**19,3),\"*10**19 per m**2 sec\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "maximum obtainable electronic emission current is 20.145 micro amp\n",
+        "emission current density is 10.07259 A/m**2\n",
+        "no. of electrons emitted per unit area per sec is 6.295 *10**19 per m**2 sec\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 3.2, Page number 67"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "Ip1=20;       #plate current(mA)\n",
+      "Ip2=30;       #changed plate current(mA) \n",
+      "Vp1=80;       #plate voltage(V)\n",
+      "\n",
+      "#Calculation\n",
+      "#Ip=K*(Vp^(3/2))\n",
+      "Vp2=((((Vp1)**(3/2))*Ip2)/Ip1)**(2/3);       #changed plate voltage(V)\n",
+      "\n",
+      "#Result\n",
+      "print \"plate voltage for 30mA current is\",round(Vp2,2),\"V\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "plate voltage for 30mA current is 104.83 V\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file