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A class room has dimension 20 x 15 x 10 m3, the reverberation time is 3 sec. calculate total absorption of its surfaces and average absorption coefficient.
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Given –

V=20×15×10m3

T=3sec

Solution –

We know that

1) T=0.161×VaS

aS=0.161×(20×15×10)3

aS=80.5 Sabines

2)  a=aSS=80.52(20×15+15×10+10×20)=0.062

∴ Total Absorption = 80.5 m2 Sabines

Average Absorption Coefficient = 0.062

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