Is a photon really massless?
53259
Do photons have mass?
48690
Does a photon interfere only with itself?
156879
"Reality" of EM waves vs. wavefunction of individual photons - why not treat the wave function as equally "Real"?
61077
Is every electromagnetic radiation considered "light"?
38454
Do anti-photons exist?
40148
Does light have mass?
38673
General relativity: For massless particles, is the momentum and velocity 4-vectors equal?
80719
What defines the mass of elementary particle?
74367
Newtonian mechanics: massless particles
98712
Are there massless bosons at scales above electroweak scale?
71897
What is Size of Photon?
149033
photon electron interaction such that the photon energy does not correspond to any state change
150075
Are photons electromagnetic waves, quantum waves, or both?
58463
How are photons "consumed"?
104024
Does the mass of an electron change with its "energy state"?
114290
Is it possible to have a singularity with zero mass?
155738
Can light be a spinor?