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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..

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..

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 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 by The Free Dictionary

The elementary particle of light and other electromagnetic radiation; the quantum of electromagnetic energy. The photon is the massless, neutral vector boson that mediates electromagnetic interactions..