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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:63e794f26755ea447faa48915f48af2a1824429b5991c82dc73f1b261af07c7e"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter11:ULTRASONICS"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex11.1:pg-303"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#to calculate fundemental frequency\n",
+      "Y=7.9*10**10 #Young modulus for quartz in Nm**-2\n",
+      "rho=2.65*10**3 #density of quartz in kg/m**3\n",
+      "#the velocity of longitudinal wave is given by\n",
+      "v=math.sqrt(Y/rho)  #in m/s\n",
+      "#for fundamental mode of vibration ,thickness is given by lamda/2\n",
+      "lamda=2*0.001 #wavelength in m\n",
+      "nu=v/lamda\n",
+      "print \"the fundamental frequency is nu=\",round(nu,2),\"Hz\"\n",
+      "#answer is given wrong in the book ,nu=2730 Hz\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "the fundamental frequency is nu= 2729987.21 Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file