The radius of the Stationary State of a hydrogen atom

1. Oct 16, 2012

DODGEVIPER13

1. The problem statement, all variables and given/known data
A Hydrogen atom is in a state with n=2?

2. Relevant equations
r=an^2
a=.0529 nm

3. The attempt at a solution
I am confused by my book it says that the radius of a stationary state is r=.0529*2^2=.2116 but I disagree isn't the stationary state n=1 which would mean the radius is .0529 nm. I thought n=2 is the first excited state in a hydrogen atom am I wrong?

2. Oct 17, 2012

dextercioby

It's excited, in the sense that it's not the ground state (it has higher energy), but it's still stationary, since the time dependence of the wavefunction for n=2 is again a complex exponential.

3. Oct 17, 2012

DODGEVIPER13

Ok thanks I understand now