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What will happen to the pitch of a sound as that sound’s source approaches an observer? Explain why this happens, based on what you have learned about wave properties.

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MathPhys

Answer:

The pitch increases

Explanation:

When the source of the sound moves, the medium becomes more compressed in front of the source, and less compressed behind it.  So to an observer being approached by the sound's source, the pitch sounds higher.

This is known as the Doppler effect.

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