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electron-volt |
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electron-volt, abbr. eV, unit of energy used in atomic and nuclear physics; 1 electron-volt is the energy transferred in moving a unit charge charge, property of matter that gives rise to all electrical phenomena (see electricity ). The basic unit of charge, usually denoted by e, is that on the proton or the electron ; that on the proton is designated as positive (+e ..... Click the link for more information. , positive or negative and equal to that charge on the electron, through a potential potential, electric, work per unit of electric charge expended in moving a charged body from a reference point to any given point in an electric field (see electrostatics ). ..... Click the link for more information. difference of 1 volt. The maximum energy of a particle accelerator particle accelerator, apparatus used in nuclear physics to produce beams of energetic charged particles and to direct them against various targets. Such machines, popularly called atom smashers, are needed to observe objects as small as the atomic nucleus in studies ..... Click the link for more information. is usually expressed in multiples of the electron-volt, such as million electron-volts (MeV) or billion electron-volts (GeV). Because mass is a form of energy (see relativity relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. ..... Click the link for more information. ), the masses of elementary particles elementary particles, the most basic physical constituents of the universe. Basic Constituents of MatterMolecules are built up from the atom , which is the basic unit of any chemical element . ..... Click the link for more information. are sometimes expressed in electron-volts; e.g., the mass of the electron, the lightest particle with measurable rest mass, is 0.51 MeV/c2, where c is the speed of light. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| In 60 of those TGFs, the energy of at least one gamma-ray photon exceeded 10 million electron-volts (MeV), about 300 times the energy of an X-ray photon in a typical medical scan. The three-input sorter is estimated to expend only 1 electron-volt of energy -- 100,000 times less than the equivalent semiconductor circuit. 20 solar flare, was particularly rich in protons packing more than 100 million electron-volts (MeV) of energy. |
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