If you don\'t conserve angular momentum you can\'t make any transitions! How can

Question

If you don't conserve angular momentum you can't make any transitions! How can you make any transitions if you don't conserve angular momentum? (a) (2 points) If an electron makes a transition with delta l = 1 and delta j = 0 (i.e. magnitude of the total angular momentum doesn't change but the orbital angular momentum of the electron does change), how is this possible? How can a system ''absorb'' the angular momentum of the photon without the magnitude of its angular momentum changing? (b) (2 points) The 2s 1s is transition in hydrogen can happen if two photons are emitted instead of 1. Explain how this can happen without violating angular momentum conservation.

Explanation / Answer

1. Transitions with ?J=

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