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+clc;clear;
+//Example 11.2
+//calculation of average absorption coefficient
+
+//given values
+
+V=10*8*6;//volume of hall in m^3
+t=1.5;//reverberation time of empty hall in sec
+A=20;//area of curtain cloth in m^2
+t1=1;//new reverberation time in sec
+
+//calculation
+a1=.161*V/t;//total absorption of empty hall
+a2=.161*V/t1;//total absorption after a curtain cloth is suspended
+
+k=(a2-a1)/(2*20);
+disp(k,'the average absorption coefficient is');