Why the free electrons in space can not be excited by photons?
15767
Can a free particle absorb/emit photons?
21066
Compton scattering vs. photoelectric effect
125691
Can kinetic energy in atoms result in emission of all types of EM radiation?
40542
From where electrons flow to make a bulb light?
79571
How can the nucleus of an atom be in an excited state?
128619
Why does an electron shell further away from nucleus has higher energy level?
83467
If electromagnetic fields give charge to particles, do photons carry charge?
154825
What's the difference between low energy photons and high energy photons?
41889
Why is the $S_{z} =0$ state forbidden for photons?
30745
Why can't photons have a mass?
149033
photon electron interaction such that the photon energy does not correspond to any state change
13251
Does a photon in vacuum have a rest frame?
144948
Why doesn't an electromagnetic wave violate conservation of energy?
48000
How do electrons and photons interact?
82218
Do we really not know why atoms 'decide' to produce a photon?
64935
Using photons to explain electrostatic force
88637
Why can a particle decay into two photons but not one?