Q.

Which of the following is a simple harmonic motion?
 

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a

 Particle moving through a string fixed at both ends.

b

Wave moving through a string fixed at both ends.

c

Earth spinning about its axis.

d

Ball bouncing between two rigid vertical walls.

answer is B.

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Detailed Solution

A wave moving through a string fixed at both ends has simple harmonic nature because once the load attached to the spring is pulled  a little from its means position and left to itself its starts oscillating about their mean position

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