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Phase Difference

For the wave ...

Question

For the wave shown in the figure, the distance between points $A$ and $D$ is $12 m$ . Find the velocity of the wave.

A

4 m s^{- 1}

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B

6 m s^{- 1}

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C

10 m s^{- 1}

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D

5 m s^{- 1}

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Solution

The correct option is D $5 m s^{- 1}$
Given, $A D = 12 m$ .

Time taken for a wave to reach from A to D

$t = 2.8 - 0.4 = 2.4 s e c$ (from graph)

Speed $= \frac{12 m}{2.4 s e c} = 5 m / s$

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