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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 16: Photoconductivity "
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 16.1, page no-416"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Pairs generated per second\n",
+      "\n",
+      "import math\n",
+      "#Variable Declaration\n",
+      "lam=0.4*10**-6                    # wavelength of light\n",
+      "A=4*10**-6                        # area of the crystal\n",
+      "in1=200.0                         # intensity of light in W/m^2\n",
+      "h=6.626*10**-34                   # Planck's constant\n",
+      "c=3*10**8                         # speed of light\n",
+      "\n",
+      "\n",
+      "#Calculation\n",
+      "N=in1*A*lam/(h*c)\n",
+      "\n",
+      "\n",
+      "#Result\n",
+      "print('The number of pairs generated per second is %.3f * 10^14'%(N*10**-14))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The number of pairs generated per second is 16.098 * 10^14\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 16.2, page no-417"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Wavelength of emitted radiation\n",
+      "\n",
+      "import math\n",
+      "#Variable Declaration\n",
+      "e=1.6*10**-19                 # Charge of electron\n",
+      "eg=1.43                       # band gap energy in eV\n",
+      "h=6.626*10**-34               # Planck's constant\n",
+      "c=3*10**8                     # speed of light in m/s\n",
+      "\n",
+      "\n",
+      "#Calculation\n",
+      "E=e*eg \n",
+      "lam=h*c/E\n",
+      "\n",
+      "\n",
+      "#Result\n",
+      "print('The wavelength of emitted radiation is %.2f \u00b5m'%(lam*10**6))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The wavelength of emitted radiation is 0.87 \u00b5m\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file