A flat horizontal board moves up and down in $SHM$ of amplitude $\alpha$. Then the shortest permissible time period of the vibration such that an object placed on the board may not lose contact with the board is
  • A$2\pi \sqrt {\frac{g}{\alpha }} $
  • B$2\pi \sqrt {\frac{\alpha}{g }} $
  • C$2\pi \sqrt {g \times \alpha } $
  • D$\frac{1}{{2\pi }}\sqrt {\frac{g}{\alpha }} $
Medium
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