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A class room has dimensions 20 × 15 × 5 m3. The reverberation time is 3.5 sec. Calculate the total absorption of its surface and average absorption coefficient.
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(Given)  T = 3.5 sec

V = 20 x 15 x 5 = 1500 m3

S = 2[20×15+15×5+20×5]=950m2.

T = 0.161VaS

Hence, Average absorption, a = 0.161×15003.5×950=0.0.72

Total Absorption of surface = $a \times …

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