An electron makes a transition from orbit $n = 4$ to the orbit $n = 2$ of tha hydrogen atom. The wave number of the emitted radiations ($R =$ Rydberg's constant) will be

  • A

    $\frac{16}{3R}$

  • B

    $\frac{2R}{16}$

  • C

    $\frac{3R}{16}$

  • D

    $\frac{4R}{16}$

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