Heisenberg Uncertainty

1. Nov 10, 2008

Quelsita

Consider and electron in ground state in the Hydrogen atom. Suppose the Bohr orbit lies in the x-y plane. Assume that the position of the electron along the orbit is completely unknown.
a)Estimate the uncretainties in x,px, y, py, z and pz.
b)Repeat for and excited state n>1. With the given information, can you say anything about the unceratinty in time? Energy?

I know how to solve for part a:
$$\Delta$$x=2a0, $$\Delta$$px=h/(2a0), $$\Delta$$y=a0, $$\Delta$$py=h/(a0), $$\Delta$$z=0 since in x-y plane, $$\Delta$$px=$$\infty$$
but I'm a little stuck how to do part b.

any help is greatly appreciated, thanks!