A loudspeaker at a rock concert generates 10-2 W/m2 at 22.0 m at a frequency of 1.0 kHz. Assume that the speaker spreads its energy uniformly in three dimensions.
(a) What is the total acoustic power output of the speaker?
in W
(b) At what distance will the intensity be at the pain threshold of 1.0 W/m2?
in m
(c) What is the intensity at 35.0 m?
in W/m2