The sound of a band is rated as 50 dB at a distance of 30.0 m.What is the dB sound level of the band when one is 10.0 m from the band?
A) 59.5 dB
B) 57.3 dB
C) 55.2 dB
D) 52.9 dB
E) 50.1 dB

Question

Quizplus · Accepted Answer

The sound intensity level decreases by 20 dB for every tenfold increase in distance. Here, the distance decreases by a factor of 3 (from 30 m to 10 m), which corresponds to an increase of approximately 9.5 dB. Thus, 50 dB + 9.5 dB = 59.5 dB.

The Sound of a Band Is Rated as 50 DB