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## Homework Statement

An atom or ion with one electron has energy levels [itex]E_n=-A/n^2[/itex]. Tw neighboring lines in its spectrum at room temperature have wavelengths [itex]\lambda_1=97.5[/itex] nm and [itex]\lambda_2=102.8[/itex] nm. (Note that [itex]hc=1.240\times 10^{-6}[/itex] eV m).

(a)What is the constant A?

(b) Identify the atom.

## Homework Equations

## The Attempt at a Solution

I know that it must be either Hydrogen (line n=3 and n=4 of the Lyman series) or Li++ (which should have frequencies very close to those of the Hydrogen. However, this is a guess and I don't know how to actually prove that.

Any idea?