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The Doppler effect is a change in the
of sound
waves that occurs wipen the source of the sound waves is
moving relative to a stationary listener.
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Answer 1

The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. Sound waves that are closer together have a higher frequency, and sound waves that are farther apart have a lower frequency.

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