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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 

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a

5.4 ms-1

b

0.184 ms-1

c

9 ms-1 

d

540 ms-1

answer is D.

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Detailed Solution

Number of waves per minute = 54 
∴ Number of waves per second = 54/60
Now v=nλ⇒n=5460×10=9 m/s.

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