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When beats are produced by two progressi...

When beats are produced by two progressive waves of nearly the same frequency, which one of the following if correct?

A

Amplitude of vibrations at any point changes simple harmonically with a frequency equal to the difference in frequency of two waves.

B

Particles vibrate harmonically with frequency equal to difference in component frequencies

C

Frequency of beats depends on the position where observer is.

D

Frequency of beats changes as time progresses.

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The correct Answer is:
D
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