The electron in a hydrogen atom makes a transition $n_1\to n_{\mathrm{2 }}$where $n_1$and $n_2$ are the principal quantum numbers of the two states. Assume the Bohr model to be valid. The time period of the electron in the initial state is $8$ times that in the final state. The possible values of $n_1$ and $n_2$ are

• Correct answer
  A

  $n_1=6,n_2=3$
• B

  $n_1=8, n_2=2$
• C

  $n_1=n_2=1$
• D

  $n_1=8, n_2=1$

Hence, the correct answer is option: 'A'.