$A$ wave is represented by $x = 0.4 \cos \left(8t - \frac{y}{2}\right)$ where $x$ and $y$ are in meters and $t$ is in seconds. The speed of the wave is

  • A
    $0.5 \ m \cdot s^{-1}$
  • B
    $8 \ m \cdot s^{-1}$
  • C
    $16 \ m \cdot s^{-1}$
  • D
    $0.1 \ m \cdot s^{-1}$

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