# photon

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## photon

[fo´ton]
a discrete particle (quantum) of radiant energy.

## pho·ton (hν, γ),

(fō'ton),
In physics, a corpuscle of energy or particle of light; a quantum of light or other electromagnetic radiation.

## photon

/pho·ton/ (fo´ton) a particle (quantum) of radiant energy.

## photon

(fō′tŏn′)
n.
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.

## photon

[fō′ton]
Etymology: Gk, phos, light
the smallest quantity of electromagnetic energy. It has no mass and no charge but travels at the speed of light. Photons may occur in the form of x-rays, gamma rays, or quanta of light. The energy (E) of a photon is expressed as the product of its frequency (v) and Planck's constant (h), as in the equation E = hv. X-ray photons occur in frequencies of 1018 to 1021 Hz and energies that range upward from 1 KeV.

## pho·ton

(γ) (fō'ton)
physics A corpuscle of energy or particle of light; a quantum of light or other electromagnetic radiation.

## photon

a quantum of radiant energy with a wavelength in the visible range of the ELECTROMAGNETIC SPECTRUM.

## Photon

A light particle.

## photon

The basic unit of radiant energy defined by the equation
E = hν
where h is Planck's constant (6.62 ✕ 10−34 joule ✕ second), ν the frequency of the light and E the energy difference carried away by the emission of a single photon of light. The term photon usually refers to visible light whereas the term quantum refers to other electromagnetic radiations. See quantum theory; wave theory; troland.

## pho·ton

(γ) (fō'ton)
In physics, corpuscle of energy or particle of light; a quantum of light or other electromagnetic radiation.

## photon

a particle (quantum) of radiant energy.

x-ray photon
a particle of x-ray energy.
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