The internal dimension of a room is 10m × 10m × 4m (height). The total area of the doors and windows are 16 m2

Q. The internal dimension of a room is 10m × 10m × 4m (height). The total area of the doors and windows are 16 m². Keeping the doors and windows closed, the reverberation time of the room becomes 1.2 second. Assume all the interior surfaces including doors and windows have same sound absorption coefficient. If all the doors and windows of the room are kept fully open, the reverberation time will be_________second (rounded off to two decimal places).

A. 3.23

B. 1.26

C. 12.6

D. None of the above

Ans: 1.26

Solution: