question_answer

A  ion is in its first excited state. Its ionization energy is :- [JEE Main 9-4-2019 Afternoon]

A) 6.04 eV

B) 13.60 eV

C) 54.40 eV

D) 48.36 eV

Correct Answer: B

Solution :

[b] Energy levels in Hydrogen like atom is  given by

As  is 1st excited state

As total energy of in 1st excited state is

ionisation energy should be