Hydrogen Atom -> Uncertainty Principle

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Hydrogen Atom ---> Uncertainty Principle

Hey guys, I'm having some trouble with this one.

[PLAIN]http://img849.imageshack.us/img849/2039/physhw.jpg

How do I get started?
 
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A good start would be stating exactly what the uncertainty principle says.
 


<x>*<p> = hcross/2

where <x> = R

so <p> = hcross/2R?
 
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