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## Homework Statement

Consider a photon that is barely capable of causing a photoelectric effect when it strikes a sodium plate having a work function of 2.55eV.

## Homework Equations

Find the minimum energy level n for a hydrogen atom that can be ionized by such a photon, and the speed of the released electron far from the nucleus.

Can someone explain to me what is this "ionize" term used in this question mean, because I don't know how to proceed?

## The Attempt at a Solution

I'm thinking "ionize" here means "exciting the atom" and if that is so, Ef - Ei = 2.55eV.

Also I first found out the energy levels for hydrogen : -13.6eV, -3.4eV, -1.51eV, -0.85eV...

So I'm thinking that I need to find the correct pair of Ef - Ei that will give 2.55eV so that I can determine the minimum energy level n for the hydrogen atom.

Please correct me where I'm wrong.