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A nearby ambulance is sitting at rest with its siren blaring. You are annoyed by this and run toward the ambulance in an effort to get the paramedic to turn off the siren.

Which of the following statements correctly describes the presence of the Doppler effect in this scenario?

A

The ambulance, the source of the sound wave, is not moving. Therefore there is no Doppler effect present.

B

There is no Doppler effect. The person must run faster than the speed of sound for a Doppler effect to be present.

C

The Doppler effect is present. There is a relative motion between the ambulance and the person. The observed frequency is less than the rest frequency.

D

The Doppler effect is present. There is a relative motion between the ambulance and the person. The observed frequency is greater than the rest frequency.

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