Sound intensity level at different distances · PhysicsBowl 2019 #31
Physics
Problem
The intensity level is measured to be 60 dB at a distance of 15 m from a speaker. What is the intensity level at a point 2.0 m from the speaker? Assume that the speaker radiates equally in all directions
(A) 55.7 dB (B) 57.5 dB (C) 67.0 dB (D) 75.5 dB (E) 77.5 dB