A horn produces sound with frequency f0. Let the frequency you hear when you are at rest and the horn moves toward you with a speed u be f1, let the frequency you hear when the horn is at rest and you move toward it with a speed u be f2.(a) Is f1 greater than, less than, or equal to f2? (b) Choose the best explanation from among the following:
I. Amoving observer encounters wave crests more often than a stationary observer, leading to a higher frequency.
II. The relative speeds are the same in either case. Therefore, the frequencies will be the same as well.
III. A moving source causes the wave crests to “bunch up,” leading to a higher frequency than for a moving observer.
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