Predict/Explain Ahorn produces sound with frequency . Let

Chapter 14, Problem 42

(choose chapter or problem)

Predict/Explain Ahorn produces sound with frequency . Let the frequency you hear when you are at rest and the horn moves toward you with a speed u be ; let the frequency you hear when the horn is at rest and you move toward it with a speed u be . (a) Is greater than, less than, or equal to ? (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.