Author Question: A car moving at 36 m/s passes a stationary police car whose siren has a frequency of 500 hz. What is ... (Read 39 times)

Chloeellawright · **on:** Jul 28, 2018

A car moving at 36 m/s passes a stationary police car whose siren has a frequency of 500 hz. What is the change in the frequency (in Hz) heard by an observer in the moving car as he passes the police car? (The speed of sound in air is 343 m/s.)
a. 416
b. 208
c. 105
d. 52
e. 552

Question 2

A car approaches a stationary police car at 36 m/s. The frequency of the siren (relative to the police car) is 500 Hz. What is the frequency (in Hz) heard by an observer in the moving car as he approaches the police car? (Assume the velocity of sound in air is 343 m/s.)
a. 220
b. 448
c. 526
d. 552
e. 383