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diff --git a/Quantum_mechanics_by_M.C.Jain/chapter13.ipynb b/Quantum_mechanics_by_M.C.Jain/chapter13.ipynb
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@@ -0,0 +1,62 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:7906c3ed6cf316425e6f8055a34bac268639221c2739520f565ed9645c9cd808"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 13 Atomic structure I: One- Electron Atoms"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.1 Page no 252"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "d=0.1                                 #m\n",
+      "v=10.0**3                               #m/s\n",
+      "a=50                                  #gradient of a magnet field Wb/m**2/m\n",
+      "b=9.274*10**-27                       #J/Wb/m**2\n",
+      "h=1.6605*10**-27\n",
+      "\n",
+      "#Calculation\n",
+      "M=107.868*h\n",
+      "z=(b/M)*a*(d**2/v**2)\n",
+      "\n",
+      "#Result\n",
+      "print\"seperation between the two component \",round(z*10**8,1),\"mm\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "seperation between the two component  2.6 mm\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file