SAT Subject Physics Practice Question 190: Answer and Explanation

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Question: 190

36. Sound waves travel at 350 m/s through warm air and at 3,500 m/s through brass. What happens to the wavelength of a 700 Hz acoustic wave as it enters brass from warm air?

A. It decreases by a factor of 20.
B. It decreases by a factor of 10.
C. It increases by a factor of 10.
D. It increases by a factor of 20.
E. The wavelength remains unchanged when a wave passes into a new medium.

Correct Answer: C

Explanation:

The frequency does not change, so the wavelength must change (because the wave speed changes).

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