Q. An observer standing near the sea shore observes 54 waves per minute. If the wavelength of the water wave is $10m$ then the velocity of water wave is
A) $540\ ms^{- 1}$
B) $5.4\ ms^{- 1}$
C) $0.184\ ms^{- 1}$
D) $9\ ms^{- 1}$
Explanation
(d) Number of waves per minute $= 54$
$\therefore$ Number of waves per second $= 54/60$
Now $v = n\lambda \Rightarrow n = \frac{54}{60} \times 10 = 9m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.