In the relation $y = a\cos (\omega t - kx)$, the dimensional formula for $k$ is

  • A

    $[{M^0}{L^{ - 1}}{T^{ - 1}}]$

  • B

    $[{M^0}L{T^{ - 1}}]$

  • C

    $[{M^0}{L^{ - 1}}{T^0}]$

  • D

    $[{M^0}LT]$

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  • [AIIMS 2003]