Emission spectrum for Helium

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Homework Statement


The numbers following are the results of a lab experiment to find the spectral lines of Helium in a gas discharge tube. The lines I got were roughly:

703nm, 660nm, 590nm, 500nm, 490nm, 470nm, 450nm.

The question is, what possible electron transitions could the electrons have went though?

Homework Equations


Energy level of hydrogen like atoms is given by:

E= [(-Z^2)(R)]/n^2


The Attempt at a Solution



I'm getting some crazy answers like transitions from n=20 to n=5, or n=9 to n=5. Intuitively, this does not seem to be correct, although my intuition is based on the hydrogen atom which has visible lines only at n=x to n=2.

So... is this correct?
 

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