When one person was talking in a small room, the sound intensity level was 60 dB everywhere within the room. Then, there were 14 people talking in similar manner simultaneously in the room, what was the resulting sound intensity level?
A)60 dB
B)79 dB
C)71 dB
D)64 dB
E)69 dB

Question

Quizplus · Accepted Answer

The sound intensity level increases by 10 dB when the number of identical sound sources increases tenfold. With 14 people, the increase is approximately 10*log10(14) ≈ 11 dB. Thus, the resulting level is 60 + 11 = 71 dB.

When One Person Was Talking in a Small Room, the Sound