A particle moves such that its acceleration $a$ is given by $a = - bx$, where $x$ is the displacement from equilibrium position and b is a constant. The period of oscillation is
  • A$2\pi \sqrt b $
  • B$\frac{{2\pi }}{{\sqrt b }}$
  • C$\frac{{2\pi }}{b}$
  • D$2\sqrt {\frac{\pi }{b}} $
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