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An observer standing at the sea coast ob...

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

A

`90 m//s`

B

`90 cm//s`

C

`9 m//s`

D

`900 m//s`

Text Solution

Verified by Experts

The correct Answer is:
C
Frequency of waves `n = 54/60` per second
`lambda = 10 m`
`therefore v = n lambda`
`= 54/60 xx 10 = 9 m//"sec"`
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