AP EAMCET Engineering 23 Sep 2020 Shift 1 Paper

As we know, excitation potential
=‌

‌ excitation energy ‌

e

Minimum excitation energy will be difference between ground level energy (n=1) and first excited state (n=2).
For hydrogen atom, energy in ground state, E1=−13.6eV
Energy in first excited state,
E2=−‌

136

22

=−‌

13.6

4

=−34eV
Energy required for excitation, ∆E=E2−E1
=−34−(−136)
=10.2eV
∴ Excitation potential, =‌

∆E

e

=‌

10.2

e

eV=10.2V