Posted by james on Wednesday, April 6, 2011 at 1:36am.
1/wavelength = RZ^2(1/2^2 - 1/4^2)
R is the Rydberg constant which is 1.09737E7 and Z = 2(don't forget to square it). You can find R more accurately if you go to google.com and type in rydberg constant and click on the wikipedia link.
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