Question

The ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is

• A. 10.2eV
• B. 0
• C. 3.4eV
• D. 6.8eV

Answer 1

Answer: (A)

10.2eV

Answer 2

1st excitation energy $E_{n2}-E_{n1}=(-3.4+13.6)$ =10.2 eV