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  4. An observer standing near the sea-coast counts 48 waves per min. If the wavelength of the wave is 10 m, the velocity of the waves will be

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Q. An observer standing near the sea-coast counts $48$ waves per min. If the wavelength of the wave is $ 10\,m, $ the velocity of the waves will be

J & K CETJ & K CET 2015Waves

Solution:

According to the question, Frequency,
$v=\frac{48}{60} Hz =\frac{4}{5}=0.8\, Hz$
Wavelength, $\lambda=10\, m$
$\therefore $ Wave velocity, $v=v \lambda=(0.8)(10)$
$=8\, m / s$