Angular momentum of hydrogen atom in specific energy level

accountkiller
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Homework Statement


A hydrogen atom is in a state with energy -0.278 eV.


Homework Equations


L = nh'


The Attempt at a Solution



The answer book says to do E_n = (-13.6 eV)/n^2 but I can't find this equation in our book. Is the 13.6 a significant number or just a different number they used for a different problem?

I know I can do this all by myself when I have time to study, but I just want to get this homework done quickly tonight to get it out of the way, since I also have a math quiz tomorrow. I promise I'm usually a good student. I'd appreciate any quick help, thanks!
 
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The 13.6eV is the Rydberg constant.
 
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