Find out the wavelength of the travelling wave given in the above figure ?

0.08 m

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0.16 m

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0.20 m

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0.40 m

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0.60 m

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Solution

The correct option is C $0.40 m$
From graph, $O P = 0.60 m$
So, the distance between 2 successive minimum, $O M = M N = N P = 0.60 / 3 = 0.20 m$
The wavelength is the length of the one complete period i.e $λ = O N$
or $λ = O M + M N = 0.20 + 0.20 = 0.40 m$

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