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clear
//
//
//
//Variable declaration
V=1500; //volume(m^3)
A1=112; //area of plastered walls(m^2)
A2=130; //area of wooden floor(m^2)
A3=170; //area of plastered ceiling(m^2)
A4=20; //area of wooden door(m^2)
n=100; //number of cushioned chairs
A5=120; //area of audience(m^2)
C1=0.03; //coefficient of absorption in plastered walls
C2=0.06; //coefficient of absorption in wooden floor
C3=0.04; //coefficient of absorption in plastered ceiling
C4=0.06; //coefficient of absorption in wooden door
C5=1.0; //coefficient of absorption in cushioned chairs
C6=4.7; //coefficient of absorption in audience
//Calculations
a1=A1*C1; //absorption due to plastered walls
a2=A2*C2; //absorption due to wooden floor
a3=A3*C3; //absorption due to plastered ceiling
a4=A4*C4; //absorption due to wooden door
a5=n*C5; //absorption due to cushioned chairs
a6=A5*C6; //absorption due to audience
aS=a1+a2+a3+a4+a5; //total absorption in hall
T1=0.165*V/aS; //reverberation time when hall is empty(sec)
T2=0.165*V/(aS+a6); //reverberation time with full capacity of audience(sec)
T3=0.165*V/((n*C6)+aS); //reverberation time with audience in cushioned chairs(sec)
//Result
printf("\n reverberation time when hall is empty is %0.2f sec",T1)
printf("\n reverberation time with full capacity of audience is %0.3f sec",T2)
printf("\n reverberation time with audience in cushioned chairs is %0.2f sec",T3)
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