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Homework Help: A Question About Selection Rules

  1. Dec 1, 2004 #1
    A hydrogen atom is in the 4p state. To what state or states can it go by radiating a photon in an allowed transition? Anyone have any ideas?
  2. jcsd
  3. Dec 2, 2004 #2
    The hydrogen atom as such is not in a state of any kind, the electron swirling around the proton does.

    In order to start thinking about the solution, ask yourself what happens to this energy state when a photon is radiated. Is it higher or lower ?

  4. Dec 2, 2004 #3
    So can it only go to a 4s state or 4d state, because of the rule which says: allowed transitions are: ∆l = +- l?
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