A room of 3m × 3m × 3m has a reverberation time of 0.8 sec

Q. A room of 3m × 3m × 3m has a reverberation time of 0.8 sec. Using Sabine’s method, the total absorption in the room is__________sabin (up to one decimal place).

Ans: 5.3 to 5.7

Sol:

RT₆₀ is the reverberation time (to drop 60 dB)
V is the volume of the room
c₂₀ is the speed of sound at 20° C (room temperature)
Sa is the total absorption in sabins.