# 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 ?
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.
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.
But such gamma rays - with energies of about 1 trillion electron-volts - turned up only in the Milky Way, most notably in the Crab nebula (SN: 4/28/90, p.
Designed to produce an intense beam of electrons with an energy of at least 4 billion electron-volts, this accelerator will allow nuclear and particle physicists to use electrons as sensitive probes for elucidating the complex structure of protons, neutrons and nuclei (SN: 8/9/86, p.

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