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+{
+ "metadata": {
+  "name": "Chapter1"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 1:Introduction"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1.1, Page 12"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#initiation of variable\n",
+      "Mn=1.008665;Mp=1.007276                                     #Given mass of an electron and a proton in terms of u\n",
+      "\n",
+      "#calculation\n",
+      "Md= Mn-Mp;                                                  #mass difference       \n",
+      "Md2=Md*931.50;                                              #converting u into Mev/c^2 by multiplying by 931.5 MeV/c^2\n",
+      "\n",
+      "#result\n",
+      "print \"Mass difference in terms of U is\",round(Md,4); \n",
+      "print\"which equals in Mev/c^2. :\",round(Md2,3);"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Mass difference in terms of U is 0.0014\n",
+        "which equals in Mev/c^2. : 1.294\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1.2, Page 12"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#initiation of variable\n",
+      "Mp=1.007276 ; Me=5.4858*10**-4; #mass of proton and electron in terms of U\n",
+      "\n",
+      "#calculation\n",
+      "Mt=Mp+Me;                      #Total mass= sum of above masses  \n",
+      "\n",
+      "#result\n",
+      "print\"The combined mass of an electron and a proton was found out to be in U.\",round(Mt,3);\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The combined mass of an electron and a proton was found out to be in U. 1.008\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1.3, Page 13"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#initiation of variable\n",
+      "h=6.621*10**-34 ; c=2.9979*10**8;                  # h is in J/s and c is  in m/s\n",
+      "hc=h*c*((10**9)/(1.6022*10**-19));               #1e=1.602*10^-19 J and 1 m=10^9 nm\n",
+      "\n",
+      "#result\n",
+      "print \"The value of hc in  eV.nm is\",round(hc,4); \n",
+      "print 'Hence zero at the end is significant.';\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The value of hc in  eV.nm is 1238.8651\n",
+        "Hence zero at the end is significant.\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file