Question

An observer standing near the sea shore/min. If the wavelength of the water wave is $ 10\,m $ then the velocity of water wave is :

• A. $ 540\,m{{s}^{-1}} $
• B. $ 5.4\,m{{s}^{-1}} $
• C. $ 0.184\text{ }m{{s}^{-1}} $
• D. $ 9\text{ }m{{s}^{-1}} $
• E. $ 48.6\text{ }m{{s}^{-1}} $

Answer 1

Answer: (D)

Frequency, $ n=\frac{54}{60} $
$ \Rightarrow $ $ n=\frac{9}{10} $
$ \therefore $ Velocity, $ v=n\lambda $ $ =\frac{9}{10}\times 10=9\,m/s $