The intensity level of sound 20 m from a jet airliner is 120 dB.At what distance from the airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound. )
A)90 m
B)120 m
C)150 m
D)200 m

Question

Quizplus · Accepted Answer

The sound intensity level decreases by 20 dB when the distance from the source is increased by a factor of 10. To decrease from 120 dB to 100 dB, the distance must increase from 20 m to 200 m.

The Intensity Level of Sound 20 M from a Jet