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in class we learned about the hydrogen atom and in particular the quantum states describing the electron in hydrogen atom (we denoted them as usual by 1s, 2s, 2p etc.). Whenever we talked about state transitions of the electron, like transition from 1s to 2p state, we imagined an electron absorbing a photon (carrying the necessary amount energy.) Similarly, in order to lose energy, we imagined an electron emitting a photon.

I am wondering if this is the only way to raise or lower the energy of an electron? I would expect that there are many different ways. But maybe the photon situation is the most probable one. It would be great if someone could tell explain how it works...