You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed and you perceive the frequency as 1340 Hz. You are relieved
That he is in pursuit of a different driver when he continues past you, but now you perceive the
Frequency as 1300 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s.
A) 41.7 m/s
B) 39.2 m/s
C) 40.1 m/s
D) 38.4 m/s
E) 30 m/s

Question

Quizplus · Accepted Answer

Using the Doppler effect formula for sound, we can calculate the speed of the police car. The change in frequency as the car approaches and then moves away allows us to solve for the car's speed.

You Are Driving Along a Highway at 35