$A$ transverse wave in a medium is given by $y = A \sin 2(\omega t - kx)$. It is found that the magnitude of the maximum velocity of particles in the medium is equal to the magnitude of the wave velocity. What is the value of $A$?

  • A
    $\frac{2 \lambda}{\pi}$
  • B
    $\frac{\lambda}{\pi}$
  • C
    $\frac{\lambda}{2 \pi}$
  • D
    $\frac{\lambda}{4 \pi}$

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