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Rydberg Constant for Helium

Homework Statement
Determine the ratio of the Rydberg constant for Helium to Hydrogen
Homework Equations
R = (Z^2*m*e^4)/(8*E0*h^3 * c)
I thought the ratio was purely 4, because Helium's Z = 2 (atomic mass). Apparently this is not true, and now I'm stuck... I think there must be some other form of equation for the rydberg constant that is more general, but google and wikipedia are not helping that much.

Any thoughts?
 

TSny

Homework Helper
Gold Member
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Hint: "reduced mass"
 

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