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The diagram below shows displacement – distance, graph of a wave travelling in a string with velocity 20ms^-1 . In each case, use graph to calculate the frequency and wave length of the wave

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5 Hz

10 Hz

7 Hz

12 Hz

answer is C.

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Detailed Solution

Given : Wave velocity V = 20ms^-1
From graph, length of one wave i.e., wave length $λ = 2 m$
From relation $V = fλ$
frequency $f = \frac{V}{λ} = \frac{20}{2} = 10 Hz$

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