The energy associated with electron in first orbit of hydrogen atom is $-2.18 \times 10^{-18} \mathrm{~J}$. The frequency of the light required (in Hz ) to excite the electron to fifth orbit is $\left(\mathrm{h}=6.6 \times 10^{-34} \mathrm{Js}\right)$

• A

  $2.17 \times 10^{16}$
• B

  $3.17 \times 10^{14}$
• C

  $2.17 \times 10^{15}$
• Correct answer
  D

  $3.17 \times 10^{15}$

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