Find the binding energy of a hydrogen atom in the state `n = 2`

Answer

C, D

Explanation

Here, `n_1 = 2`, `n_2 = oo`
`E=(-13.6)/n_1^2-(-13.6)/(n_1^2)`
`=13.6((1)/(n_2^2) - (1)/(n_1^2))`
`=13.6((1)/(oo)-(1)/(4))`
`=(-13.6)/(4)-3.4 eV`