The equation of a progressive wave is $Y = a \sin 2 \pi (n t - \frac{x}{5})$. The ratio of maximum particle velocity to wave velocity is

  • A
    $\frac{\pi a}{5}$
  • B
    $\frac{2 \pi a}{5}$
  • C
    $\frac{3 \pi a}{5}$
  • D
    $\frac{4 \pi a}{5}$

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