1. Tardigrade
  2. Question
  3. Physics
  4. The electron in the lowest (n = 1) orbit in hydrogen atom has energy - 13.6 eV. How much energy is required to ionize a hydrogen atom which is already in the first excited level?

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. The electron in the lowest $(n = 1)$ orbit in hydrogen atom has energy - $13.6 \,eV$. How much energy is required to ionize a hydrogen atom which is already in the first excited level?

Chhattisgarh PMTChhattisgarh PMT 2004

Solution:

Ionisation energy $E=\frac{-13.6}{n^{2}} eV$
For first excited state $n=2$
So, $E=\frac{-13.6}{2^{2}}=3.4\, eV$
$ =3.4 \,eV$ (numerically)