The change in pitch of a train's horn as it passes while you are standing still can be explained by A. resonance. B. the Doppler effect. C. sympathetic vibration. D. ultrasonic vibrations.
(1) Answers
B. the Doppler effect. The Doppler effect is a phenomenon whereby the frequency from a moving object towards an observer appears to increase while the frequency appears to decrease as it moves away from the observer.
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