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@@ -0,0 +1,139 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:fa25aede5e2048b3aef3db7a512e42eedd41c6618ebcfbecf8cd5a65f6b8e6f4"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 12 Ultrasonics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.1 Page no 388"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "y=115*10**9                                  #N/m**2\n",
+      "t=40.0*10**-3\n",
+      "a=7.25*10**3                                 #kg/m**3\n",
+      "\n",
+      "#Calculation\n",
+      "import math\n",
+      "n=(math.sqrt(y/a))/(2*t)\n",
+      "\n",
+      "#Resut\n",
+      "print\"Fundamental frequency is\",round(n*10**-3,1),\"KHz\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Fundamental frequency is 49.8 KHz\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.2 Page no 388"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "y=8*10**10                          #N/m**2\n",
+      "a=5000.0                               #Kg/m**3\n",
+      "V=400.0\n",
+      "\n",
+      "#Calculation\n",
+      "import math\n",
+      "v=math.sqrt(y/a)\n",
+      "w=v/V\n",
+      "\n",
+      "#Result\n",
+      "print\"(a) Velocity is\", v,\"m/sec\"\n",
+      "print\"(b) Wavelength is\",w,\"mt\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "(a) Velocity is 4000.0 m/sec\n",
+        "(b) Wavelength is 10.0 mt\n"
+       ]
+      }
+     ],
+     "prompt_number": 11
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.3 Page no 389"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "v=1700                               #m/s\n",
+      "t=0.65                                #sec\n",
+      "n=0.7*10**5\n",
+      "\n",
+      "#Calculation\n",
+      "d=v*t/2.0\n",
+      "w=v/n\n",
+      "\n",
+      "#Result\n",
+      "print\"Depth of sea is\", d,\"m\"\n",
+      "print\"Wavelength of pulse is\",round(w,4),\"m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Depth of sea is 552.5 m\n",
+        "Wavelength of pulse is 0.0243 m\n"
+       ]
+      }
+     ],
+     "prompt_number": 19
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file