Q.

Consider a travelling simple harmonic wave Y=Asin(ωtkx)  on a string of mass per unit length and tension T. Kinetic energy per unit length is given by u k = 1 2 μ δy δt 2   and potential energy per unit length is given by u p = 1 2 T δy δx 2  . Mark the correct options:

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a

A very small element of string has zero potential energy when it is at its equilibrium position. 

b

For a small element u k   and u p   will change periodically with angular frequency ω  

c

Total energy per unit length of a string is constant when a harmonic wave travels on it.

d

u k   and u p   simultaneously attain their maximum and minimum values.

answer is B.

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