Uncertainty principle and hydrogen atom electron

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Homework Statement



Using the uncertainty principle find the energy required for the electron to be confined inside the hydrogen atom. Use the radius of the atom 1 x 10-10 m for Δr. Express your answer in eV, rounded up to the nearest hundredth.

Homework Equations



ΔxΔp[tex]\geq[/tex]h/4pie
x=position in space
p=momentum

The Attempt at a Solution



is is the radius of the atom=Δx? and if it is how do i get the momentum of the electron?
 

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