PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics
Problem
A music student notices that, when a police car with its siren sounding approaches and then recedes from him, the frequency of the siren changes from 480 Hz to 400 Hz. If the speed of sound in air is 330 ms−1 ,
(a) determine the speed at which the police car was travelling.
(b) Determine the frequency of the sound emitted by the police car's siren.