# Uncertainty principle

1. Feb 22, 2009

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1. The problem statement, all variables and given/known data

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.

2. Relevant equations

Δx(Δp)$$\geq$$h/4pie
x= position in space
p= momentum (mass)(velocity)
3. The attempt at a solution

ok im not sure how Δr (radius) goes into the uncertainty principle, i know how it works and how it shows that it can not be exactly precise but i just dont understant how Δr would fall in the equation

is it just 1 x 10^-10 m$$\geq$$4.14x10^-15 eV/12.56637061?

2. Feb 22, 2009