Apolice car is rapidly approaching you at a stop light. explain what happens to the frequency of the sound as the police car draws closer. what do you hear?

When the police car is moving towards you, the sound waves are more compressed together, leading to a higher pitch sound. This is according to the Doppler Effect, in which sound waves ahead of the object is more compressed, leading to a higher pitch, and more spread out behind, leading to a lower pitch.

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