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

  • chem - ,

    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 and type in rydberg constant and click on the wikipedia link.

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