Heisenberg Uncertainty

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,p_x, y, p_y, z and p_z.
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:
[tex]\Delta[/tex]x=2a₀, [tex]\Delta[/tex]p_x=h/(2a₀), [tex]\Delta[/tex]y=a₀, [tex]\Delta[/tex]p_y=h/(a₀), [tex]\Delta[/tex]z=0 since in x-y plane, [tex]\Delta[/tex]p_x=[tex]\infty[/tex]
but I'm a little stuck how to do part b.

any help is greatly appreciated, thanks!