Question
Question: Excitation energy of a hydrogen like ion, in its first excitation state, is 40.8 eV. The energy need...
Excitation energy of a hydrogen like ion, in its first excitation state, is 40.8 eV. The energy needed to remove the electron from the ion in ground state is-
A
13.6 eV
B
27.2 eV
C
40.8 eV
D
54.4 eV
Answer
54.4 eV
Explanation
Solution
10.2 Z2 = 40.8 Ž Z = 2
13.6 Z2 = ? = 13.6 × 4 = 54.4 eV