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## Homework Statement

What wavelengths will be emitted if you bombard hydrogen gas (in its ground state) with 13 eV electrons.

## Homework Equations

## The Attempt at a Solution

I talked to my professor about this one and he mumbled something about the ratio of the energies. I know the ground state energy is -13.6 eV and it's getting hit with 13 eV electrons. The ratio is 13/-13.6 = -.956

Or, I was reading that I should add the energies and then find the wavelength. Either way, the wavelength is pretty tiny...

Can I get a hint at what to do?

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