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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#Chapter 2 , Energy Levels and Electron Emission"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 2.1 , Page Number 33 "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      " Emission current is  0.0166  A.\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "\n",
+    "#Variables\n",
+    "\n",
+    "phi = 3.4              #Voltage (in electron-volt)\n",
+    "e = 1.6 * 10**-19      #Charge on electron (in Coulomb)\n",
+    "A = 6.0 * 10**4        #Emission constant (in Ampere per meter-square per kelvin-square)\n",
+    "T = 2000.0             #Temperature (in kelvin)\n",
+    "l = 40.0 * 10**-3      #Length (in meter)\n",
+    "D = 0.2 * 10**-3       #Diameter (in meter)\n",
+    "k = 1.38 * 10**-23     #Boltzmann constant (in meter-square kilogram per second-square per kelvin)\n",
+    "\n",
+    "#Calculation\n",
+    "\n",
+    "b = phi * e /k         #Constant \n",
+    "Js = A*T**2*math.exp(-b/T)  #Emission current density (in Ampere per meter-square)\n",
+    "S = math.pi * D * l    #Emitting surface (in meter-square)\n",
+    "I = Js * S             #Emission current (in Ampere)       \n",
+    "\n",
+    "#Result\n",
+    "\n",
+    "print \"Emission current is \",round(I,4),\" A.\"\n",
+    "\n",
+    "#Slight variation due to higher precision."
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}