If a simple harmonic motion is represented by $\frac{{\mathrm{d}}^2\mathrm{x}}{{\mathrm{dt}}^2}+\mathrm{\alpha x}=0$ its time period is

• A

  $2\mathrm{\pi \alpha }$

• B

  $2\mathrm{\pi }\sqrt{\mathrm{\alpha }}$

• C

  $2\mathrm{\pi }/\mathrm{\alpha }$

• D

  $2\mathrm{\pi }/\sqrt{\mathrm{\alpha }}$