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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

You are driving toward the base of a cliff and you honk your horn. (a) Is there a Doppler shift of the sound when you hear the echo? If so, is it like a moving source or moving observer? (b) What if the reflection occurs not from a cliff, but from the forward edge of a huge alien spacecraft moving toward you as you drive?

(a)

To determine
Whether there a Doppler shift of the sound when the echo is heard from the base of the cliff. If so, is it like a moving source or moving observer.

Explanation

Doppler effect is the change in frequency heard by an observer whenever there is relative motion between a source and the observer. When you honk your horn sound wave starts to propagate outward from the horn. After striking the base of the cliff, the sound gets reflected back from the base of the cliff. Since you are driving towards the base of the cliff, there is a relative motion between observer (you)and the virtual source (cliff). Waves are reflected back from the cliff, so cliff acts as a virtual source...

(b)

To determine
Is there a Doppler shift of the sound when the echo is heard from forward edge of a huge alien spacecraft moving towards you.

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