Question

The excitation energy of first excited state of a hydrogen like atom is `40.8 eV`. Find the energy needed to remove the electron to form the ion.

Answer 1

Correct Answer - `54.4 eV`
`40.8=(Delta E)_(2 to 1)xxZ^(2) rArr 40.8=10.2xxZ^(2) rArr z^(2)=4 "or" Z=2`
`IE=13.6 Z^(2)=13.6xx4=54.4 eV`