The equation of motion of a particle of mass $1\,g$ is $\frac{{{d^2}x}}{{d{t^2}}} + {\pi ^2}x = 0$ where $x$ is displacement (in $m$ ) from mean position. The frequency of oscillation is .... $s$ (in $Hz$ )
  • A$0.5$
  • B$2$
  • C$5\sqrt {10}$
  • D$\frac {1}{5\sqrt {10}}$
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