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diff --git a/Oscillations_and_Waves_by_S._Prakash/chapter15.ipynb b/Oscillations_and_Waves_by_S._Prakash/chapter15.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 15, Musical sound & acoustic of buildings"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1, page 518"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "from math import log10\n",
+      "# decibles\n",
+      "#given data :\n",
+      "i1=4 #assume\n",
+      "i2=4*i1 #\n",
+      "dl=10*log10(i2/i1) #db\n",
+      "print \"Decibles by which intensity level will decrease = %0.2f db \" %dl"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Decibles by which intensity level will decrease = 6.02 db \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 2, page 519"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import sympy\n",
+      "# ratio of amlitudes\n",
+      "#given data :\n",
+      "l1=10 #db\n",
+      "l2=40 #db\n",
+      "dl=l2-l1 #db\n",
+      "x=(10**(dl/10)) #\n",
+      "x1=sympy.sqrt(x) #\n",
+      "print \"Ratio of amplitudes =\", x1"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Ratio of amplitudes = 10*sqrt(10)\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3, page 521"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# frequency\n",
+      "#given data :\n",
+      "x=264 #key note\n",
+      "g=x*(3.0/2) #\n",
+      "print \"Frequency of note G = %0.f \" %g\n",
+      "cd1=x*2 #\n",
+      "print \"Frequency of note C = %0.f \"%cd1"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Frequency of note G = 396 \n",
+        "Frequency of note C = 528 \n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}