A boat at anchor is rocked by waves whose crests are $100 m$ apart and velocity is $25 m / s e c$ . The boat bounces up once in every :

2500 s

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75 s

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4 s

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0.25 s

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Solution

The correct option is C $4 s$
Information provided:
Wavelength = 100m
Wave velocity = 25m/s
Wave velocity = Frequency x wavelength
$v = f λ$
Frequency = 25/100
Time period = 100/25 = 4 sec

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