Question

An observer standing near the sea shore observes 54 waves per minute. If the wavelength of the water wave is 10 m 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

Answer 1

The correct option is D 9 ms^-1

Number of waves per minute = 54
$\therefore$ Number of waves per second = $\frac{54}{60}$

Now $v=n\lambda \Rightarrow n=\frac{54}{60}\times 10=$ 9 m/s.