(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

What is the electronic transition of He II when it emits 468.6 nm photon.

2. Relevant equations

[tex]\frac{1}{\lambda}=4R\left(\frac{1}{m^2}-\frac{1}{n^2}\right)[/tex]

3. The attempt at a solution

I know it is a pashen-alpha line from googling but I don't know how to find that from this equation with two unknowns. I know the energy levels are discrete so there is probably only one transition that makes this wavelength. Don't know why He II and not He I so I might be missing something.

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# Determine electronic transitions by the emitted wavelength?

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