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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 is correct ?

A

The particle vibrates simple harmonically, with the frequency equal to the difference in the component frequencies

B

The amplitude of vibrations at any point change simple harmonically with a frequency proportional to the difference in the frequency of the two waves

C

The frequency of a beat changes as the time progresses

D

all the above

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The correct Answer is:
B
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