Given that: $\lambda = a \cos \left( \frac{t}{p} - qx \right)$,where $t$ represents time in $s$ and $x$ represents distance in $m$. Which of the following statements is true?

  • A
    The unit of $x$ is same as that of $q$
  • B
    The unit of $x$ is same as that of $p$
  • C
    The unit of $t$ is same as that of $q$
  • D
    The unit of $t$ is same as that of $p$

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