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## Homework Statement

Calculate the probability that the electron in the ground state of a hydrogen atom is in the region 0 < r < 3.75a0.

## Homework Equations

a0=.0529 nm

P(r)=4(Z/a0)^3*r^2*e^(-2Zr/a0)

## The Attempt at a Solution

I am confused because I am not sure if I am supposed to use 3.75a0 as my radius. I guess I am not supposed to since I did that and got it wrong. I cannot figure out what else to do. However, I have also seen the probability density written as:

P(r)[tex]\Delta[/tex]r=[4(Z/a0)^3*r^2*e^(-2Zr/a0)][tex]\Delta[/tex]r

If this is the correct formula, I am not sure what to use for delta r.

Any help would be much appreciated.