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-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:cb0c026235eca0bc18a695dcb9668ea4e2691af702577b5109cf13ded8d1630d"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter11-Architectural Acoustics"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Ex1-pg293"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "import math\n",
-      "##Example 11.1\n",
-      "##calculation of total absorption and average absorption coefficient\n",
-      "\n",
-      "##given values\n",
-      "\n",
-      "V=20*15*5.;##volume of hall in m**3\n",
-      "t=3.5;##reverberation time of empty hall in sec\n",
-      "\n",
-      "\n",
-      "##calculation\n",
-      "a1=.161*V/t;##total absorption of empty hall\n",
-      "k=a1/(2.*(20*15+15*5+20*5.));\n",
-      "print'%s %.2f %s'%('the average absorption coefficient is',k,'');"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "the average absorption coefficient is 0.07 \n"
-       ]
-      }
-     ],
-     "prompt_number": 3
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Ex2-pg293"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "import math\n",
-      "##Example 11.2\n",
-      "##calculation of average absorption coefficient\n",
-      "\n",
-      "##given values\n",
-      "\n",
-      "V=10*8.*6.;##volume of hall in m**3\n",
-      "t=1.5;##reverberation time of empty hall in sec\n",
-      "A=20.;##area of curtain cloth in m**2\n",
-      "t1=1.;##new reverberation time in sec\n",
-      "\n",
-      "##calculation\n",
-      "a1=.161*V/t;##total absorption of empty hall\n",
-      "a2=.161*V/t1;##total absorption after a curtain cloth is suspended\n",
-      "\n",
-      "k=(a2-a1)/(2.*20.);\n",
-      "print'%s %.2f %s'%('the average absorption coefficient is',k,'');\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "the average absorption coefficient is 0.64 \n"
-       ]
-      }
-     ],
-     "prompt_number": 2
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Ex3-pg293"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "import math\n",
-      "##Example 11.3\n",
-      "##calculation of average absorption coefficient and area\n",
-      "\n",
-      "##given values\n",
-      "\n",
-      "V=20*15*10.;##volume of hall in m**3\n",
-      "t=3.5;##reverberation time of empty hall in sec\n",
-      "t1=2.5;##reduced reverberation time \n",
-      "k2=.5;##absorption coefficient of curtain cloth\n",
-      "##calculation\n",
-      "a1=.161*V/t;##total absorption of empty hall\n",
-      "k1=a1/(2*(20*15+15*10+20*10));\n",
-      "print'%s %.2f %s'%('the average absorption coefficient is',k1,'');\n",
-      "a2=.161*V/t1;##total absorption when wall is covered with curtain\n",
-      "a=t1*(a2-a1)/(t1*k2);\n",
-      "print'%s %.2f %s'%('area of wall to be covered with curtain(in m^2)is:',a,'')"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "the average absorption coefficient is 0.11 \n",
-        "area of wall to be covered with curtain(in m^2)is: 110.40 \n"
-       ]
-      }
-     ],
-     "prompt_number": 1
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file