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