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The equation (d^2x / dt^2) + alpha x = 0...

The equation `(d^2x / dt^2)` + `alpha` x = 0` for a particle performing S.H.M. Then the time period of the motion will be

A

`2 (pi) alpha`

B

`2 pi sqrt (alpha)`

C

`2(pi) /alpha`

D

`2 pi / sqrt (alpha)`

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