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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?
  • AThe unit of $x$ is same as that of $q$
  • BThe unit of $x$ is same as that of $p$
  • CThe unit of $t$ is same as that of $q$
  • DThe unit of $t$ is same as that of $p$
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