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A boat at anchor is rocked by waves whos...

A boat at anchor is rocked by waves whose crests are `100 m` apart and whose speed is `25 m//s`. These waves reach the boat once every :

A

2500 s

B

75 s

C

4 s

D

0.25 s

Text Solution

Verified by Experts

The correct Answer is:
C
The boat bounces up, i.e. it travels from crest to the cosecutive crest along wave motion.
Wavelength = distance between two consecutive crests
i.e. `lambda = 100m `
Velocity of wave, `v=25 m//s`
Hence, time is one bounce of boat
`t=(lambda)/(v)=(100)/(25)=4s`
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