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//Chapter-4,Example4_15_9,pg 4-30
S1=220 //wall area
a1=0.03 //absorption coefficient for the wall
S2=120 //floor area
a2=0.8 //absorption coefficient for the floor
S3=120 //ceiling area
a3=0.06 //absorption coefficient for the ceiling
V=600 //volume of room
S=S1+S2+S3 //total surface area
a=(a1*S1+a2*S2+a3*S3)/S //average sound absorption coefficient
printf("1) average sound absorption coefficient =")
disp(a)
T=(0.161*V)/(a*S) //Reverberation time,using Sabine's formula
printf("2) Reverberation time =")
disp(T)
printf("sec")
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