- #1

hhhmortal

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## Homework Statement

The expectation value <r> of the electron-nucleus separation distance 'r' is:

<r> = ʃ r |ψ|² dV.

(a) Determine <r> for the 1, 0, 0 state of hydrogen.

## The Attempt at a Solution

Right, I've obtained the value for ψ = (1/πa³)^1/2 exp(-r/a)

I then replace dv by 4πr² dr.

I then put all of that in the equation above and try to integrate but I can't seem to go any further from here. Any help?

Thanks very much.