Answer :


The tension in the string (T) is 200 N

Mass of the string = L = 2.5 kg

The length of the stretched string = 20.0 m

Now the mass per unit length of the string is given by μ,

The velocity (v) of transverse wave of the string is given by the relation;

So, the time taken by the disturbance to reach the end of the string,

Hence option B is the correct answer.

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