Q153 / 155 · WBJEE 2018 · Physics

The intensity of a sound appears to an observer to be periodic. Which of the following can be the cause of it?

Correct answer
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
Correct answer
D
The source is producing a sound composed of two nearby frequencies

Solution

The intensity of a sound source appears be periodic due to (i) source intensity is periodic. (ii) source is producing a sound composed of two nearby frequencies.

Hence, the correct answer is options: 'A', 'D'.

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