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

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12 sec

14 sec

18 sec

116 sec

answer is C.

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Detailed Solution

Beat period T=1n1~n2=1384−380=14sec. Hence minimum time interval between maxima and minima t=T2=18sec.

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