what are photon particles?
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: Under the photon theory of light, a photon is a discrete bundle (or quantum)
of electromagnetic (or light) energy. Photons are always in motion
and, in a vacuum, have a constant speed of light to all observers, at
the vacuum speed of light (more commonly just called the speed of light)
of c = 2.998 x 108 m/s.
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A photon is an elementary particle, the quantum of light and all other forms of electromagnetic radiation, and the force carrier for the electromagnetic force, even when static via virtual photons. The effects of this force are easily observable at both the microscopic and macroscopic level, because the photon has zero rest mass; this allows long distance interactions. Like all elementary particles, photons are currently best explained by quantum mechanics and exhibit wave–particle duality, exhibiting properties of both waves and particles. For example, a single photon may be refracted by a lens or exhibit wave interference with itself, but also act as a particle giving a definite result when its position is measured.
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