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diff --git a/Modern_Physics_by_K_S_Krane/1-Introduction.ipynb b/Modern_Physics_by_K_S_Krane/1-Introduction.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 1: Introduction"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.1: Mass_difference_between_a_proton_and_a_neutron.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clear    \n",
+"clc\n",
+"disp('Exa-1.1');\n",
+"Mn=1.008665;Mp=1.007276                                     //Given mass of an electron and a proton in terms of u\n",
+"Md= Mn-Mp;                                                  //mass difference\n",
+"printf('Mass difference in terms of U is %f ',Md);         \n",
+"Md=Md*931.50;                                              //converting u into Mev/c^2 by multiplying by 931.5 MeV/c^2\n",
+"printf('which equals %.3f Mev/c^2.',Md);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.2: Total_mass_of_proton_and_electron.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clear     \n",
+"clc\n",
+"disp('Exa-1.2');\n",
+"Mp=1.007276 ; Me=5.4858*10^-4; //mass of proton and electron in terms of U\n",
+"Mt=Mp+Me;                      //Total mass= sum of above masses   \n",
+"printf('The combined mass of an electron and a proton was found out to be %f U.',Mt);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.3: Value_of_hc.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clear     \n",
+"clc\n",
+"disp('Exa-1.3');\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",
+"printf('The value of hc is %f eV.nm\n',hc); \n",
+"printf('Rounding off to 4 digits, we obtain %4.f eV.nm.',hc);\n",
+"disp('Hence zero at the end is significant.');"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}