So I've recently learned about photoelectric effect. It made sense at first, but when I try to combine it with what I thought I knew about emission and reflection of photon, things become rather messy.
My questions :
1)When photons interact with electrons, they can either be absorbed or reflected or pass right through. Is that correct?
2)When light photon excites an electron in the inner shell, it is absorbed. A photon is subsequently given off during de-excitation. Does the photon given off have the same energy as the photon absorbed earlier?
3)If the answer to the above question is "yes"(which is what I have been taught in school, though it's a struggle to reason it), then how is the process different from reflection? Say it absorbs light photon and then re-emits the exact same photon.
4)to add to question 2 and 3,how come in some cases, photons with shorter wavelengths are apparently radiated as photons with longer wavelength? (Earth absorbing uv but radiates it as infrared).
There are likely to be major mistakes in my understandings, which would explain why I can't seem to puzzle all these phenomena together... Any correction would be greatly appreciated!