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Propagating solutions to Maxwell’s equations in classical electromagnetism and real photons in quantum electrodynamics. A superset of thermal-radiation.

5 votes

Do all the photons have the same energy?

No, the energy of a photon is connected to its frequency $\nu$ via $$ E = h\nu $$ where $h$ is the Planck constant. So a blue photon is more energetic than a red one, for example.
Wojciech Morawiec's user avatar