chem
posted by james .
determine the wavelength of the line in the emission spectrum produced by an electron transition He+ from ni= 4 to nf= 2.

chem 
DrBob222
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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