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--- a/Modern_Physics_By_G.Aruldas/Chapter21_2.ipynb
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@@ -1,106 +0,0 @@
-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:42eb4bd0fae1331d52fd855bad43219acea712dc31c5270f1f64fa698ba366ad"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "21: Elementary particles"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example number 21.1, Page number 399"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#importing modules\n",
-      "import math\n",
-      "from __future__ import division\n",
-      "\n",
-      "#Variable declaration\n",
-      "mpi=140;     #mass of pi-meson\n",
-      "mp=938.3;    #mass of proton\n",
-      "mk=498;   #mass of k\n",
-      "m=1116;  \n",
-      "\n",
-      "#Calculation\n",
-      "Q=mpi+mp-mk-m;    #Q-value(MeV)\n",
-      "\n",
-      "#Result\n",
-      "print \"Q-value is\",round(Q),\"MeV\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "Q-value is -536.0 MeV\n"
-       ]
-      }
-     ],
-     "prompt_number": 3
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example number 21.2, Page number 399"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#importing modules\n",
-      "import math\n",
-      "from __future__ import division\n",
-      "\n",
-      "#Variable declaration\n",
-      "mpc2=938.3;    #energy of proton(MeV)\n",
-      "Epic2=139.6;   #energy of pi-meson(MeV)\n",
-      "mnc2=939.6;    #energy of neutron(MeV)\n",
-      "KE=0.6;    #kinetic energy of neutron(MeV)\n",
-      "\n",
-      "#Calculation\n",
-      "Epi=mpc2+Epic2-mnc2-KE;    #energy conservation(MeV)\n",
-      "mpic2=math.sqrt((Epi**2)-((mnc2+KE)**2)+(mnc2**2));   #pi0 mass(MeV)\n",
-      "\n",
-      "#Result\n",
-      "print \"pi0 mass is\",round(mpic2,1),\"MeV\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "pi0 mass is 133.5 MeV\n"
-       ]
-      }
-     ],
-     "prompt_number": 5
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file