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Question

Two tuning forks have frequencies 380Hz and 384Hz respectively. when they are sounded together, they produce 4 beats. After hearing the maximum sound, how long will take to hear the minimum sound

A
1/4 sec
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B
1/8 sec
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C
1 sec
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D
2 sec
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Solution

The correct option is B 1/8 sec
Beat period T=1n1n2=1384380=14sec
hence minimum time interval between maxima and minima t=T2=142=18sec
Hence,
option (B) is correct answer.

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