$A$ hydrogen atom falls from $n^{\text{th}}$ higher energy orbit to the first energy orbit $(n=1)$. The energy released is equal to $12.75 \text{ eV}$. The $n^{\text{th}}$ orbit is:

  • A
    $n=4$
  • B
    $n=3$
  • C
    $n=6$
  • D
    $n=5$

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