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

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Zubair Aslam
Zubair AslamLv8
3 Nov 2020
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

When a car with its horn blowing drives by an observer, the pitch of the horn seems higher as it approaches and lower as it recedes (see the figure). This phenomenon is called the Doppler effect. If the sound source is moving at speed relative to the observer and if the speed of sound is , then the perceived frequency f is related to the actual frequency   as follows:

 

We choose the minus sign if the source is moving toward the observer and the plus sign if it is moving away.
Suppose that a car drives at 110 ft/s past a woman standing on the shoulder of a highway, blowing its horn, which has a frequency of 500 Hz. Assume that the speed of sound is 1130 ft/s. 

(a) What are the frequencies of the sounds that the woman hears as the car approaches her and as it moves away from her?
(b) Let A be the amplitude of the sound. Find functions of the form

 

that model the perceived sound as the car approaches the woman and as it recedes.

 

 

a tour boat in a norwegian fjord approaches a shoreline, which is an essentially a vertical cliff. the boats whistle is sounded with frequency of f=100 hz and the passengers on the boat hear the echo frequency of 116 hz. the student from phys260 lays a wager that she can find the speed of the boat from this information. can you do it?? if so, not only you will win your wager, but also get a good grade on this test. ( take the speed of sound to be 330 m/s)

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