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Photon - Wikipedia

The photon is a type of elementary particle. It is the 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, and they always move at the speed of light in vacuum, 299 792 458 m/s..

What Is a Photon in Physics? - ThoughtCo

A photonis a particle of light defined as a discrete bundle (or quantum) of electromagnetic (or light) energy. Photons are always in motion and, in a vacuum (a completely empty space), have a constant speed of light to all observers. Photons travel at the vacuum speed of light(more commonly just called the speed of light) of c= 2.998 x 108m/s..

photon | Definition & Discovery | Britannica

Photon, also called light quantum, minute energy packet of electromagnetic radiation. The concept originated (1905) in Albert Einstein ’s explanation of the photoelectric effect, in which he proposed the existence of discrete energy packets during the transmission of light..

Photon | Definition of Photon by Merriam-Webster

Definition of photon 1 : a quantum of electromagnetic radiation Should a substance happen to have a lot of electrons in a higher level, and a lower level is mostly empty …, then a photon can cause an electron to transfer from a higher state to a lower one..

Photon | Definition of Photon at Dictionary.com

The subatomic particle that carries the electromagnetic force and is the quantum of electromagnetic radiation. The photon has a rest mass of zero, but has measurable momentum, exhibits deflection by a gravitational field, and can exert a force. It has no electric charge, has an indefinitely long lifetime, and is its own antiparticle..