Physics

Problem

A police car with its siren sounding is stationary in heavy traffic. A pedestrian notices that, although the loudness of the sound produced does not change, the pitch varies. Which row describes the amplitude and the frequency of the sound?

	amplitude	frequency
A	constant	constant
B	constant	varying
C	varying	constant
D	varying	varying

A) amplitude: constant; frequency: constant B) amplitude: constant; frequency: varying C) amplitude: varying; frequency: constant D) amplitude: varying; frequency: varying

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