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diff --git a/Engineering_Physics_by_Shyam_Singh_and_Rajeev_Singh/Chapter5.ipynb b/Engineering_Physics_by_Shyam_Singh_and_Rajeev_Singh/Chapter5.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:766f8db46f5669c6f5759d5eab7e64f8d7d90b920fc4c9477c5cb4c2747c652e"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "5: Wave and Quantum Mechanics and X-rays"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 5.1, Page number 145"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "h = 6.63*10**-34;        #planck's constant(J)\n",
+      "c = 3*10**8;           #velocity of light(m/s)\n",
+      "lamda = 6328;          #wavelength of laser(angstrom)\n",
+      "ev = 6.24*10**18;         #conversion factor from J to eV\n",
+      "\n",
+      "#Calculation\n",
+      "lamda = lamda*10**-10;        #wavelength of laser(m)\n",
+      "E = h*c/lamda;          #energy of photon(J)\n",
+      "Eev = E*ev;               #energy of photon(eV)\n",
+      "Eev = math.ceil(Eev*10**3)/10**3;   #rounding off to 3 decimals\n",
+      "\n",
+      "#Result\n",
+      "print \"energy of photon is\",round(E/1e-19,2),\"*10**-19 J or\",Eev,\"eV\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "energy of photon is 3.14 *10**-19 J or 1.962 eV\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 5.2, Page number 145"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "lamda = 6730;       #wavelength of laser(angstrom)\n",
+      "p = 1;           #output power(mW)\n",
+      "h = 6.63*10**-34;        #planck's constant(J)\n",
+      "c = 3*10**8;           #velocity of light(m/s)\n",
+      "\n",
+      "#Calculation\n",
+      "p = p*10**-3;         #output power(W)\n",
+      "lamda = lamda*10**-10;        #wavelength of laser(m)\n",
+      "n = p*lamda/(h*c);         #number of photons(per sec)\n",
+      "\n",
+      "#Result\n",
+      "print \"number of photons emitted is\",round(n/1e+15,2),\"*10**15 per sec\"\n",
+      "print \"answer given in the book is wrong\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "number of photons emitted is 3.38 *10**15 per sec\n",
+        "answer given in the book is wrong\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 5.3, Page number 146"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "l = 3*10**-2;        #coherence length for sodium light(m)\n",
+      "lamda = 5893;      #wavelength(angstrom)\n",
+      "c = 3*10**8;           #velocity of light(m/s)\n",
+      "\n",
+      "#Calculation\n",
+      "lamda = lamda*10**-10;        #wavelength(m)\n",
+      "n = l/lamda;       #number of oscillations\n",
+      "tc = l/c;          #coherence time(s)\n",
+      "\n",
+      "#Result\n",
+      "print \"number of oscillations is\",round(n)\n",
+      "print \"the coherence time is\",tc,\"s\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "number of oscillations is 50908.0\n",
+        "the coherence time is 1e-10 s\n"
+       ]
+      }
+     ],
+     "prompt_number": 14
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file