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The wavelengths of the sound are compressed, making them shorter, and thus the frequency (and the pitch) higher. So the person in the oncoming car hears the siren operating at a higher pitch than the ambulance driver hears the same siren.

This phenomenon is known as the Doppler effect.

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Antonio Crona

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4y ago

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As you drive down the road you see and hear an approaching ambulance How is the frequency you hear different from that being produced by the ambulance?

The wavelengths of the sound are compressed, making them shorter, and thus the frequency (and the pitch) higher. So the person in the oncoming car hears the siren operating at a higher pitch than the ambulance driver hears the same siren. This phenomenon is known as the Doppler effect.


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