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1. en.wikipedia.org › wiki › PhotonPhoton - Wikipedia

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   1 day ago · A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force. Photons are massless particles that always move at the speed of light ...

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   How many polarization states does a photon have?

   • In a vacuum, a photon has two possible polarization states. The photon is the gauge boson for electromagnetism, : 29–30 and therefore all other quantum numbers of the photon (such as lepton number, baryon number, and flavour quantum numbers) are zero. Also, the photon obeys Bose–Einstein statistics, and not Fermi–Dirac statistics.

   Photon - Wikipedia

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   What if a photon is massless?

   • Although the galactic vector potential is large because the galactic magnetic field exists on great length scales, only the magnetic field would be observable if the photon is massless. In the case that the photon has mass, the mass term 1 2 m2AμAμ would affect the galactic plasma.

   Photon - Wikipedia

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   Why do physicists believe in the Maxwell theory of light?

   • Since the Maxwell theory of light allows for all possible energies of electromagnetic radiation, most physicists assumed initially that the energy quantization resulted from some unknown constraint on the matter that absorbs or emits the radiation.

   Photon - Wikipedia

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   What is the probabilistic nature of light-particle motion?

   • A probabilistic nature of light-particle motion was first considered by Newton in his treatment of birefringence and, more generally, of the splitting of light beams at interfaces into a transmitted beam and a reflected beam.

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