Question

Problem 6:   Two students are standing the same distance from a source of sound. The first student receives a power of 246 × 10^-6 W in their eardrum. The second student receives σ = 1.17 times more power in their eardrum.

(A) If the second student's eardrum has a diameter of d = 1 cm what was the intensity of the sound that the student heard, in watts per square meter?

(B) In this problem take the speed of sound to be 349 m/s. How fast, in meters per second, does an observer need to approach a stationary sound source in order to observe a 4.5 % increase in the emitted frequency?

Answer 1