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diff --git a/Modern_Physics/Chapter16.ipynb b/Modern_Physics/Chapter16.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:f4f136f0af18cf143b33cec13dfb6a06f3807644fa35b75af1bd5439584b255b"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 16: Cosmology"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 16.1, page no. 15"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "#Variable declaration\n",
+      "\n",
+      "c = 3.0 * 10 ** 5       #speed of light (km/s)\n",
+      "H0 = 20 * 10**-6        #(km/s/lightyear)\n",
+      "\n",
+      "#Calculation\n",
+      "\n",
+      "Rmax = c/(4*H0)\n",
+      "\n",
+      "#Result\n",
+      "\n",
+      "print \"The maximum distance at which the Hubble's law applies without relativistic correction is\",round(Rmax/10**9),\"X 10^9 lightyears.\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The maximum distance at which the Hubble's law applies without relativistic correction is 4.0 X 10^9 lightyears.\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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