MHT CET Physics question

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

(A)Amplitude of vibrations at any point changes simple harmonically with a frequency equal to the difference in frequencies of two wavesCorrect
(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

Answer: (A)

Solution

The resultant is , so the amplitude at a point varies harmonically with beat frequency (option a); (b) is wrong

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Question ID VK-070221