A spring has a certain mass suspended from it and its period for vertical oscillation is $T$. The spring is now cut into two equal halves and the same mass is suspended from one of the halves. The period of vertical oscillation is now

  • A

    $\frac{T}{2}$

  • B

    $\frac{T}{\sqrt{2}}$

  • C

    $\sqrt{2}T$

  • D

    $2T$

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