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Q.

A particle executes simple harmonic motion with a frequency f . The frequency with which its kinetic energy oscillates is

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a

f/2

b

f

c

2f

d

4f

answer is C.

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Detailed Solution

Kinetic energy  K=12mv2=12ma2ω2cos2ω t =14mω2a2(1+cos2ω t)  hence kinetic energy varies periodically with double the frequency of S.H.M. i.e. 2ω .
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