First slide

Introduction to waves

Question

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

Moderate

A

540 ms^-1
B

5.4 ms^-1
C

0.184 ms^-1
D

9 ms^-1

Solution

Number of waves per minute = 54
$∴$ Number of waves per second = 54/60
Now $v = nλ \Rightarrow n = \frac{54}{60} \times 10 = 9 m / s .$

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