Which of the following electron transition in hydrogen atom will require the energy equivalent to its ionization energy?

Options

A. from `n = 1` to `n = 2`
B. from `n = 2` to `n = 3`
C. from `n = 1` to `n = 3`
D. from `n = 1` to `n = oo`

Answer

D

Explanation

In ionisation `e^(-)` jump from n orbit to `oo` orbit