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Question

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

A
2500s
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B
75s
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C
4s
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D
0.25s
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Solution

The correct option is C 4s
The distance between the two consecutive crests in transverse wave motion is called wavelength.
The boat bounces up, ie, it travels from crest to the consecutive crest along wave motion.
Wavelength =distance between two consecutive crests
ie,
Velocity of wave =2m/s
Hence, time in one bounce of boat
t=λv=10025=4s

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