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Q.

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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a

5 Hz

b

10 Hz

c

7 Hz

d

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=2m
From relation  V=fλ
frequency f=Vλ=202=10Hz

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