A rectangular room has walls 6 m and 10m long and 3m high. The sidewalls have...
A rectangular room has walls 6 m and 10m long and 3m high. The sidewalls have absorptivity ?=0.05. The floor has a carpet with ?=0.45, and the roof is made of wood with ?=0.15. A machine is placed in the room and gives a background noise level of 65dB re 20
Homework Answers
VOLUME=LBH
=6*10*3
=180m3
area=2(60+30+18)
=216m2
=0.161*180/216*0.65
=0.2064seconds
dB=10log(I/I0)
from this find I
=
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