An observer standing at the sea coast observes `54 waves` reaching the coast per minute. If the wavelength of a wave is `10 m`, find the wave velocity.

Options

A. `4 ms^(-1)`
B. `7 ms^(-1)`
C. `19 ms^(-1)`
D. `12 ms^(-1)`

Answer

C

Explanation

Number of waves reaching per second,
`n = 54/60 = 0.9 Hz`
`lambda = 10 m`
Using, `v = nlambda`, we have
`v = 0.9 xx 10 = 9 m//s`