Q. A boat at anchor is rocked by waves whose crests are 100m apart and velocity is$\ 25ms^{- 1}$. The boat bounces up once in every
A) 2500 s
B) 75 s
C) 4 s
D) 0.25 s
Explanation
(c) The boat bounces up, ie, it travels from crest to the consecutive crest along wave motion. Wavelength=distance between two consecutive crest ie,
$\lambda = 100\ m$
Velocity of wave=$25ms^{- 1}$
Hence, time in one bounce of boat
$t = \frac{\lambda}{v} = \frac{100}{25} = 4s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.