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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 6: Classification of solids"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.1, page no-143"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Wavelength of light emitted from LED\n",
+      "\n",
+      "import math\n",
+      "#variable declaration\n",
+      "e=1.609*10**-19             # charge of an electron\n",
+      "eg=1.8                      # energy band gap\n",
+      "h=6.626*10**-34             # Planck's constant\n",
+      "c=3*10**8                   # speed of light\n",
+      "\n",
+      "\n",
+      "#calculation\n",
+      "E=e*eg\n",
+      "lamda=h*c/E\n",
+      "\n",
+      "#Result\n",
+      "print('The wavelength of light emitted from given LED is %.3f \u00b5m'%(lamda*10**7))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The wavelength of light emitted from given LED is 6.863 \u00b5m\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.2, page no-144"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Band gap of given GaAsP\n",
+      "\n",
+      "import math\n",
+      "#variable declaration\n",
+      "lam=6715*10**-10          # wavelength of greenlight from mercury lamp\n",
+      "h=6.626*10**-34           # planck's constant\n",
+      "c=3*10**8                 # speed of light\n",
+      "e=1.6*10**-19             # charge of an electron\n",
+      "\n",
+      "#calculation\n",
+      "Eg=h*c/lam\n",
+      "Eg=Eg/e\n",
+      "\n",
+      "#Result\n",
+      "print('The band gap of the given GaAsP is %.1f eV'%(math.floor(Eg*10)/10))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The band gap of the given GaAsP is 1.8 eV\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file