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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#15: Non Destructive Testing"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 15.1, Page number 412"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The frequency to which a piezo electric oscillator circuit should be turned is 2.7451 *10**6 Hz\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "t=0.1*10**-2;   #thickness of piezo electric crystal(m)\n",
+    "E=80*10**9;     #Young's modulus of crystal(pa)\n",
+    "d=2654;     #density of material of crystal(Kgm^-3)\n",
+    "\n",
+    "#Calculation\n",
+    "f=1/(2*t)*math.sqrt(E/d);     #The frequency to which a piezo electric oscillator circuit should be turned(Hz)\n",
+    "\n",
+    "#Result\n",
+    "print \"The frequency to which a piezo electric oscillator circuit should be turned is\",round(f/10**6,4),\"*10**6 Hz\""
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}