SAT Subject Physics Practice Question 189: Answer and Explanation

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Question: 189

35. In which of the following situations involving a source of sound and a detector of the sound is it possible that there is NO perceived Doppler shift?

A. The source travels toward the stationary detector.
B. The detector travels toward the stationary source.
C. Both the source and the detector travel in the same direction.
D. Both the source and detector travel in opposite directions, with the source and detector moving away from each other.
E. Both the source and detector travel in opposite directions, with the source and detector moving toward each other.

Correct Answer: C

Explanation:

If both the source and detector travel in the same direction and at the same speed, there will be no relative motion and hence no Doppler shift.

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