You are standing on a sidewalk. There is a car in the distance. The horn on the car sounds. You hear it at a pitch that corresponds to a sound frequency lower than the frequency emitted by the horn. What can you conclude?
A)The wind has a component of its velocity in a direction toward you.
B)The car is moving on a line directly away from your present location.
C)The wind has a component of its velocity in a direction away from you.
D)The car has a component of its velocity in a direction away from you.
E)Either A or C must be true.

Question

Quizplus · Accepted Answer

The Doppler effect explains that if the car is moving away from you, the frequency of the sound you hear is lower than the frequency emitted by the horn.

You Are Standing on a Sidewalk