Question
Asked Dec 28, 2019
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(a) You are driving down the highway in your car when a police car sounding its siren overtakes you and passes you. If its frequency at rest is f0, is the frequency you hear while the car is catching up to you higher or lower than f0? (b) What about the frequency you hear after the car has passed you?

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Expert Answer

Step 1

The frequency of the car that is catching up can be found using the concept of Doppler effect. Doppler effect is the change in frequency heard by an observer whenever there is relative motion between a source of sound and the observer is called Doppler effect.

Formula for Doppler effect is,

Physics homework question answer, step 1, image 1
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Step 2

The police car is catching you up. Relative to you, the po...

Physics homework question answer, step 2, image 1
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