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diff --git a/Oscillations_and_Waves_by_S._Prakash/chapter11.ipynb b/Oscillations_and_Waves_by_S._Prakash/chapter11.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 11, Lissajous' Figures "
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1, page 448"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Frequencies\n",
+      "#given data :\n",
+      "t=2.0 # in sec\n",
+      "n1=100.0 # in vibrations/sec\n",
+      "n2a=n1+(1/t) \n",
+      "n2b=n1-(1/t) \n",
+      "print \"Frequency, n2a = %0.2f \" %n2a\n",
+      "print \"frequency, n2b = %0.2f \"%n2b"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Frequency, n2a = 100.50 \n",
+        "frequency, n2b = 99.50 \n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 2, page 448"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "# Frequencies\n",
+      "#given data :\n",
+      "t1=15 # in sec\n",
+      "t2=10 # in sec\n",
+      "n2=400 # in vibrations/sec\n",
+      "n1a=n2+(1/t1) \n",
+      "n1b=n2-(1/t1) \n",
+      "print \"Frequency, n1a = %0.2f Hz \" %n1a\n",
+      "print \"Frequency, n1b = %0.2f Hz \" %n1b\n",
+      "n_1a=n2+(1/t2) \n",
+      "n_1b=n2-(1/t2) \n",
+      "print \"Frequency, n_1a = %0.2f Hz \" %n_1a\n",
+      "print \"Frequency, n_1b = %0.2f Hz \" %n_1b"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Frequency, n1a = 400.07 Hz \n",
+        "Frequency, n1b = 399.93 Hz \n",
+        "Frequency, n_1a = 400.10 Hz \n",
+        "Frequency, n_1b = 399.90 Hz \n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3, page 449"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Frequencies\n",
+      "#given data :\n",
+      "t1=15 # in sec\n",
+      "t2=10 # in sec\n",
+      "n2=256 # in vibrations/sec\n",
+      "n1a=(2*n2)+(1/t1) \n",
+      "n1b=(2*n2)-(1/t1) \n",
+      "print \"Frequency, n1a = %0.2f Hz \" %n1a\n",
+      "print \"Frequency, n1b = %0.2f Hz \" %n1b\n",
+      "n_1a=(2*n2)+(1/t2) \n",
+      "n_1b=(2*n2)-(1/t2) \n",
+      "print \"Frequency, n_1a = %0.2f Hz \" %n_1a\n",
+      "print \"Frequency, n_1b = %0.2f Hz \" %n_1b"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Frequency, n1a = 512.07 Hz \n",
+        "Frequency, n1b = 511.93 Hz \n",
+        "Frequency, n_1a = 512.10 Hz \n",
+        "Frequency, n_1b = 511.90 Hz \n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}