A plane wave is described by the equation $y = 3\cos \left( {\frac{x}{4} - 10t - \frac{\pi }{2}} \right)$. The maximum velocity of the particles of the medium due to this wave is
  • A$30$
  • B$\frac{{3\pi }}{2}$
  • C$3/4$
  • D$40$
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