The equation of a progressive wave is given by $y = 6 \cos(100t - 4x)$ where $y$ is in $\mu\text{m}$, $x$ is in metre and $t$ is in second. The ratio of the maximum particle velocity to the velocity of wave is

  • A
    $1.5 \times 10^{-5}$
  • B
    $2.0 \times 10^{-6}$
  • C
    $2.4 \times 10^{-5}$
  • D
    $2.8 \times 10^{-6}$

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