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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# 13: Acoustics of Buildings and Acoustic Quieting"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 1, Page number 13-14"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "reverberation time of hall without audience is 3.9 seconds\n",
+      "reverberation time of hall with audience is 1.963 seconds\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable Declaration\n",
+    "A=92.9;          #absorption(m**2)\n",
+    "V=2265;          #volume(m**3)\n",
+    "\n",
+    "#Calculation\n",
+    "T1=0.161*V/A;        #reverberation time of hall without audience(seconds)\n",
+    "T2=0.161*V/(A*2);    #reverberation time of hall with audience(seconds)\n",
+    "\n",
+    "#Result\n",
+    "print \"reverberation time of hall without audience is\",round(T1,1),\"seconds\"\n",
+    "print \"reverberation time of hall with audience is\",round(T2,3),\"seconds\""
+   ]
+  }
+ ],
+ "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": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}