For a particle performing $S.H.M.$,the equation is $\frac{d^2 x}{dt^2} + \alpha x = 0$. Then the time period of the motion will be

  • A
    $\frac{2 \pi}{\alpha}$
  • B
    $2 \pi \alpha$
  • C
    $2 \pi \sqrt{\alpha}$
  • D
    $\frac{2 \pi}{\sqrt{\alpha}}$

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