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diff --git a/Engineering_Physics_by_G._Aruldhas/Chapter17_1.ipynb b/Engineering_Physics_by_G._Aruldhas/Chapter17_1.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:d4400dbe9ddae05e5ab81173c9df50e2e9dde25edf961941bd9c8dc15f5a6fe1"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "17: Ultrasonics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 17.1, Page number 352"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "f = 3;        #Fundamental vibrational frequency of quartz crystal(MHz)\n",
+      "Y = 7.9*10**10;       #Young's modulus of quartz(N/m**2)\n",
+      "rho = 2650;      #Density of quartz(kg/m**3)\n",
+      "\n",
+      "#Calculation\n",
+      "f = f*10**6;    #Fundamental vibrational frequency of quartz crystal(Hz)\n",
+      "l = 1/(2*f)*math.sqrt(Y/rho);    #Thickness of vibrating quartz at resonance(m)\n",
+      "l = l*10**3;       #Thickness of vibrating quartz at resonance(mm)\n",
+      "l = math.ceil(l*100)/100;     #rounding off the value of l to 2 decimals\n",
+      "\n",
+      "#Result\n",
+      "print \"The thickness of vibrating quartz at resonance is\",l, \"mm\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The thickness of vibrating quartz at resonance is 0.91 mm\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file