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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# 14: Acoustics of Buildings and Acoustic Quieting"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 1, Page number 14.18"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "reverbration time is 3.9 s\n",
+      "reverbration time when audience fill the hall is 1.95 s\n",
+      "reverbration time is reduced to one-half\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "V=2265;      #volume(m**3)\n",
+    "a=92.9;      #absorption(m**2)\n",
+    "\n",
+    "#Calculation\n",
+    "T=0.16*V/a;    #reverbration time(s)\n",
+    "T2=T/2;        #reverbration time when audience fill the hall(s)\n",
+    "\n",
+    "#Result\n",
+    "print \"reverbration time is\",round(T,1),\"s\"\n",
+    "print \"reverbration time when audience fill the hall is\",round(T2,2),\"s\"\n",
+    "print \"reverbration time is reduced to one-half\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 2, Page number 14.18"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "reverbration time is 0.8 second\n",
+      "reverbration time when hall is empty is 1.6 second\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "V=12*30*6;    #volume(m**3)\n",
+    "A1=450;       #area of plastered wall(m**2)\n",
+    "a1=0.03;      #coefficient of absorption(m**2)\n",
+    "A2=360;       #area of wooden floor(m**2)\n",
+    "a2=0.06;      #coefficient of absorption(m**2)\n",
+    "A3=24;        #area of glass(m**2)\n",
+    "a3=0.25;      #coefficient of absorption(m**2)\n",
+    "A4=600;       #area of seats(m**2)\n",
+    "a4=0.3;       #coefficient of absorption(m**2)\n",
+    "A5=500;       #area of hall with audience(m**2)\n",
+    "a5=0.43;      #coefficient of absorption(m**2)\n",
+    "\n",
+    "#Calculation\n",
+    "A=(A1*a1)+(A2*a2)+(A3*a3)+(A4*a4)+(A5*a5);    #total absorption(m**2)\n",
+    "Ae=A-(A5*a5);                                 #absorption when hall is empty(m**2) \n",
+    "T=0.16*V/A;   #reverbration time(second)\n",
+    "Te=0.16*V/Ae; #reverbration time when hall is empty(second)\n",
+    "\n",
+    "#Result\n",
+    "print \"reverbration time is\",round(T,1),\"second\"\n",
+    "print \"reverbration time when hall is empty is\",round(Te,1),\"second\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 3, Page number 14.19"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "total absorption is 1000 m**2 or OWU\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "V=7500;    #volume(m**3)\n",
+    "T=1.2;     #reverbration time(second)\n",
+    "\n",
+    "#Calculation\n",
+    "A=0.16*V/T;     #total absorption(OWU)\n",
+    "\n",
+    "#Result\n",
+    "print \"total absorption is\",int(A),\"m**2 or OWU\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 4, Page number 14.19"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "change in reverbration time is 0.727 second\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "V=12*10**4;      #volume(m**3)\n",
+    "a=13200;         #absorption(m**2)\n",
+    "\n",
+    "#Calculation\n",
+    "T1=0.16*V/a;    #reverbration time(s)\n",
+    "T2=T1/2;         #reverbration time when audience fill the hall(s)\n",
+    "T=T1-T2;        #change in reverbration time(second)\n",
+    "\n",
+    "#Result\n",
+    "print \"change in reverbration time is\",round(T,3),\"second\""
+   ]
+  }
+ ],
+ "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
+}