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A classroom has dimension 10×8×6m3. the reverberation time is 3 sec. calculate the total absorption of surface and average absorption. - Applied Physics 1

Sum

A classroom has dimension 10×8×6m3. the reverberation time is 3 sec. calculate the total absorption of surface and average absorption. 

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Solution

Given Data :- V = 10×8×6 = 480m
                     S = 2[(10×8) + (8×6) + (10×6)] = 376 m3
                    T = 3 sec.

Formula :-` T = 0.161V/A = 0.161 V/(α_(av).S)`

Calculations:- `A = ( 0.161×V)/T = (0.161×480)/3 = 25.76 " sabine" -m^2`
`α_(av) = A/S =( 25.76)/(376) = 0.068 ` sabine.

Answer :- Total absorption , A = 25.76  sabine-m

Average absorption coefficient, αav  = 0.068 sabine

Concept: Reflection of Sound(Reverberation and Echo)
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