When a wave travels in a medium, the particle displacement is given by : $y = asin\, 2 \pi \,(bt -cx)$, where $a, b$ and $c$ are constants. The maximum particle velocity will  be twice the wave velocity if

  • A

    $c = \frac{1}{\pi a}$

  • B

    $c = \pi a$

  • C

    $b = ac$

  • D

    $b = \frac{1}{ac}$

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