Given that: $\lambda  = a\,\cos \,\left( {\frac{t}{p} - qx} \right)$ , where $t$ represents time in second and $x$ represents distance in metre. 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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