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in Physics by (71.1k points)

A boat at anchor is rocked by waves whose consecutive crests are 100 m apart. The wave velocity of the moving crests is 20 m/s. What is the frequency of rocking of the boat?

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Given, wavelength of wave, λ = 100 m 

and wave velocity, v = 20 m/s

∴ Frequency of rocking of boat = frequency of wave

or f = v/λ = 20/100 = 0.20 Hz.

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