How can a photon have energy when its mass is zero?
3909
Does $E = mc^2$ apply to photons?
21256
If energy can neither be created nor be destroyed,what is the ultimate source of energy?
88637
Why can a particle decay into two photons but not one?
34626
How does the propagation of gravity work for photons?
30422
Are photon energies universally quantized?
53259
Do photons have mass?
100630
Why doesn't the potential energy of any object equal 0
27825
Bending of light - photon's inertia instead of mass
149674
Kinetic energy of a photon and Schwarzschild radius
114290
Is it possible to have a singularity with zero mass?
98184
Can a photon be absorbed by a proton?
8048
How does one account for the momentum of an absorbed photon?
62419
Einstein equation $E=mc^2$: Does it mean an object without mass does not have energy?
131406
Can you split a photon?
29631
How much energy does a photon need to form a black hole?
20037
Do photons have acceleration?
1537
Is a photon "fixed in spacetime"?