The equation of travelling wave is $y=a \sin 2 \pi\left(p t-\frac{x}{5}\right)$. Then the ratio of maximum particle velocity to wave velocity is ...........
  • A$\frac{\pi a}{5}$
  • B$2 \sqrt{5 \pi a}$
  • C$\frac{2 \pi a}{5}$
  • D$\frac{2 \pi a}{\sqrt{5}}$
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