Question

A) When one person shouts at a football game, the sound intensity level at the center of the field is 60.1 dB. When all the people shout together, the intensity level increases to 90.0 dB. Assuming that each person generates the same sound intensity at the center of the field, how many people are at the game?

B)A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1020 Hz. The bird-watcher, however, hears a frequency of 1060 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?

Answer 1