question_answer

If \[13.6\] eV energy is required to ionise the hydrogen atom, then the energy required to remove an electron from \[n=2\], is [AIEEE 2002]

A) \[10.2\] eV

B) 0 eV

C) \[3.4\] eV

D) \[6.8\] eV

Correct Answer: C

Solution :

[c] Energy required to remove an electron from nth orbit of H-atom is

Here,

Therefore,

So, this amount of energy (in positive) required to ionise the electron from  level.