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Energy of shielded Electron in K-shell

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Homework Statement



The L shell absorption edge of rubidium is at 1.81kev and the K (n = 2 -> 1 ) emission line is at 13.41 kev. Calculate the energy of the K-Shell electron in rubidium, and hence estimate the effective nuclear charge for K-Shell electrons.

Homework Equations



Alkali so [tex]E = R_h(Z-S)^2 / n^2 [/tex]
where S = shielding

The Attempt at a Solution



K-Shell is in the ground state, n =1. I'm confused at how to use the absorption edge info to find the energy of the rubidium in the K-shell.
 
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