# electronvolt

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## electronvolt

a unit of energy equal to the work done on an electron accelerated through a potential difference of 1 volt. 1 electronvolt is equivalent to 1.602 × 10--19 joule.

## Electronvolt

A unit of energy used for convenience in atomic systems. Specifically, it is the change in energy of an electron, or of any particle having a charge numerically equal to that of an electron, when it is moved through a difference of potential of 1 mks volt. Its value (in mks units) is obtained from the equation W = qV, where W is energy in joules, q the charge in coulombs, and V the potential difference in volts. For a potential difference of 1 volt and the electronic charge of 1.602 × 10-19 coulomb, the electronvolt is 1.602 × 10-19 joule. See Electron, Ionization potential

## electronvolt

(i-lek-tron-vohlt ) Symbol: eV. A unit of energy equal to the energy acquired by an electron falling freely through a potential difference of one volt. It is equal to 1.6022 × 10–19 joule. High-energy electromagnetic radiation is usually referred to in terms of the energy of its photons: a photon energy of 100 eV is equivalent to a radiation frequency of 2.418 × 1016 hertz. The energies of elementary particles are usually quoted in eV; their rest masses are generally referred to in terms of their energies in eV.

## electronvolt

[i′lek‚trän ‚vōlt]
(physics)
A unit of energy which is equal to the energy acquired by an electron when it passes through a potential difference of 1 volt in a vacuum; it is equal to (1.60217646±0.00000006) × 10-19 volt. Abbreviated eV.
References in periodicals archive ?
The INTEGRAL survey is the first of its kind to glimpse into the largely unexplored higher-energy, or "hard," X-ray regime of 20,000 to 40,000 electron-volts.
Iron also emits X rays at the slightly lower energy of 6,400 electron-volts.
The detection of a cosmic ray with an energy of 3 x 102o electron-volts - the highest energy ever recorded for a cosmic ray - also suggests that these rays can't be relics from the early universe.
6 billion electron-volts produced copious quantities of subatomic particles called upsilons.
But the bulk of the X-ray background - the high-energy spectrum above a few thousand electron-volts (eV) - remained a mystery.
Generated by data from the Compton Gamma Ray Observatory's (GRO) EGRET telescope, the map depicts emissions with an energy greater than 100 million electron-volts.
Analyzing accumulated data from billions of collisions that produced no top quark, physicists using the CDF detector now report 108 billion electron-volts (108 GeV) as the new lower limit on the top quark's mass.
satellite will image medium-energy X-ray emissions from 300 to 12,000 electron-volts.
Such minute changes in path alter the beam energy by as much as 10 million electron-volts - enough to make the moon's gravitational effect the cause of the dominant error in determinations of the [Z.
NASA's Compton Gamma Ray Observatory (GRO) found that the puzzling source had become the most powerful radiator detected at the X-ray energy of 100,000 electron-volts.
The ejected electrons gather into compact bunches and reach an energy of 46 billion electron-volts as they race down the SLC's 2-mile track to crash head-on into high-energy, unpolarized positrons traveling at the same speed.
Electrons accelerated to several million electron-volts of energy emit these radio waves in the corona as they spiral around strong magnetic fields.

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