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//chapter5,Example5_3,pg 98
V=1450
A1=112*0.03//absorption due to plastered wall
A2=130*0.06//absorption due to wooden floor
A3=170*0.04//absorption due to plastd. celing
A4=20*0.06//absorption due to wooden door
A5=100*1//absorption due to cushioned chairs
sum_as=A1+A2+A3+A4+A5
T1=(0.161*V)/sum_as//reverberation time case-1
T2=(0.161*V)/(sum_as+(60*4.7))//persons=60,A=4.7 case-2
T3=(0.161*V)/(sum_as+(100*4.7))//seat cushioned=100 rev. case-3
printf("rev. time for case-1\n")
printf("T1=%.3f sec",T1)
printf("\nrev. time for case-2\n")
printf("T2=%.3f sec",T2)
printf("\nrev. time for case-3\n")
printf("T3=%.3f sec",T3)
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