$A$ wave is represented by $x = 4 \cos \left(8t - \frac{y}{2}\right)$,where $x$ and $y$ are in $m$ and $t$ is in $s$. The frequency of the wave (in $s^{-1}$) is .........

  • A
    $\frac{4}{\pi}$
  • B
    $\frac{8}{\pi}$
  • C
    $\frac{2}{\pi}$
  • D
    $\frac{\pi}{4}$

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