MHT CET Physics question

Waxing and waning of sound is noticeable if waxing and waning repeats at an interval

(A)Less than 1/10 s
(B)More than 1/10 s
(C)Between 1/10 sec and 1/3 sCorrect
(D)Between 1/3 sec and 1 s

Answer: (C)

Solution

Beats are clearly noticed when the beat frequency lies between about 3 Hz and 10 Hz, i.e. the interval between successive waxings is between 1/10 s and 1/3 s; shorter

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Question ID VK-070051