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diff --git a/Engineering_Physics/Chapter_22.ipynb b/Engineering_Physics/Chapter_22.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 22: Nanopyhsics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 22.1, Page 22.13"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Given \n",
+      "d = 12e-6 # diameter in m\n",
+      "d_ = 90e-9 # diameter of nanoparticle in m\n",
+      "\n",
+      "#Calculations\n",
+      "r = d / 2\n",
+      "r_ = d_ / 2\n",
+      "k = r / 3\n",
+      "k_ = r_ / 3\n",
+      "R = k_ / k\n",
+      "\n",
+      "#Result\n",
+      "print \"The ratio of the value of Nb/Ns of spherical particle and nanoparticle = %.1e\"%R"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The ratio of the value of Nb/Ns of spherical particle and nanoparticle = 7.5e-03\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file