Question

The intensity of a sound appears to an observer to be periodic. Which of the following can be cause of it?
(A) The intensity of the source is periodic
(B) The source is moving towards the observer
(C) The observer is moving away from the source
(D) The source is producing a sound composed of two nearby frequencies

Answer 1

Ans : (A,D) Due to difference of frequencies phenomenon of beat occures

Answer 2

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Answer 3

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