A Question About Selection Rules

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A hydrogen atom in the 4p state can transition to lower energy states by radiating a photon. The selection rules dictate that allowed transitions must change the orbital angular momentum quantum number (l) by ±1. Therefore, the atom can transition to the 4s state (l=0) or the 4d state (l=2). The discussion emphasizes understanding the implications of energy states when a photon is emitted. Allowed transitions are constrained by these selection rules.
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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?
 
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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 ?

Regards,
Leo
 
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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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