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diff --git a/Physical_Chemistry/Chapter3.ipynb b/Physical_Chemistry/Chapter3.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:491d30e4e083aec11bc84fdc5735ea79764fcb01fd2223f482cd31ce71e9fd49"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 3 - Waves and Quanta"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9 - pg 83"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate the Vibrational degrees of freedom\n",
+      "#initialization of variables\n",
+      "atoms=5\n",
+      "#calculations\n",
+      "f=3*atoms\n",
+      "fvib=f-3-3\n",
+      "#results\n",
+      "print '%s %d' %(\"Vibrational degrees of freedom = \",fvib)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Vibrational degrees of freedom =  9\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file