Consider a room that is 6m long, 5m wide and 3m high and whose walls, floor and ceiling have the same sound absorption coefficient (α=0.01). When all machines are in use, the sound pressure level (SPL) within the room amounts to 90 dB. A carpet is to be placed on the floor to improve the working environment. If the noise level within the room is to be lowered to 80 dB, what should the carpet’s sound absorption coefficient (αcarpet) be?
0.019
0.194
0.388
0.038
more than 1 (cannot be reached)
0.777
3 answers