# 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.
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

## 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

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

## 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.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

## 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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The physicists calculated the new particle's mass at 6.2 billion electronvolts, about six times that of a proton and very close to theorists' predictions.
If the Higgs particle has a mass at the high end of its predicted range, about 115 billion to 200 billion electronvolts, it should be easily detected, its decay products standing out dramatically against the background of particle debris from other processes.
Her team found that the X rays peaked at an energy of 10,000 electronvolts. Using that information, the team calculated the energy carried by particles in the jets.
As much as I hate to disagree, the "Chart of the Nuclides for Naval Reactors, USDOE, that I have hanging on my wall lists the half-life of bismuth-209 as greater than or equal to 2 x [10.sup.18] years with an alpha-particle-decay mode of 3.07 million electronvolts.
One study focuses on lower-energy cosmic rays that originate within our galaxy and have energies up to 1,000 trillion electronvolts. The findings support the popular notion that the particles are generated by shock waves from supernovas, the explosive death of massive stars.
So-called killer electrons, which are charged particles revved up to energies greater than 1 million electronvolts, punch through the skin of spacecraft.
148), researchers now report that they've pinned down the origin of the background at energies where it had remained most elusive--above 2,000 electronvolts. The results suggest that supermassive black holes lurking at the cores of galaxies are far more common than visible-light observations have revealed.
The ions--a searing beam of 30 trillion protons, with energies up to 50 million electronvolts (MeV)--burst from the far side of the target.

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