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In which of the following is the Doppler Effect symmetric?

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In which of the following is the Doppler Effect symmetric?

(a) Water

(b) Air

(c) Liquid

(d) Light

I got this question during an interview.

I'd like to ask this question from Reverberation in section Waves of Engineering Physics I

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Right answer is (d) Light

The explanation is: Doppler effect is said to be asymmetric. However, Doppler effect in light is symmetric. This is because sound or mechanical waves in general, have a velocity relative to the medium through which they travel whereas light or electromagnetic waves travel quiet and independent of it.

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