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Homework Help: The radius of the Stationary State of a hydrogen atom

  1. Oct 16, 2012 #1
    1. The problem statement, all variables and given/known data
    A Hydrogen atom is in a state with n=2?

    2. Relevant equations
    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. jcsd
  3. Oct 17, 2012 #2


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    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.
  4. Oct 17, 2012 #3
    Ok thanks I understand now
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