An electron collides with a hydrogen atom in its ground state and excites it to $n=3$. The energy given to hydrogen atom in this inelastic collision is(neglect the motion of hydrogen atom)

• A

  $10.2 \mathrm{e}\mathrm{V}$
• Correct answer
  B

  $12.1 \mathrm{e}\mathrm{V}$
• C

  $12.5 \mathrm{e}\mathrm{V}$
• D

  None of these

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