In a problem sheet there was a question asking us to guess why a photon released from an electron dropping energy levels does not have the exact difference.

My guess is that the electron needs some small amount of energy to actually drop from its excited state to the lower state, but I have no concrete explanation. Why is this the case?


marked as duplicate by Emilio Pisanty quantum-mechanics May 20 at 14:54

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ There's multiple questions asking essentially the same thing on the site, some have been linked as duplicates and their Linked and Related questions add another layer. Please read all of them carefully; if your question remains unanswered, please edit this post to explain why the existing answers don't address your query. $\endgroup$ – Emilio Pisanty May 20 at 14:57