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What is the word for the apparent change in frequency of a vibration due to relative change in position of the observer?

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ABoyle's Law
BEcho
CArchimedes's Principle
DDoppler effect

Correct Option: 4  

Explanation:
Doppler effect
Usually applied to the sound of engines approaching and moving away, it is also a tool used in astronomy using light.
posted Jul 2, 2018 by Yogeshwar Thakur

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