![]() ![]() Therefore, one electronvolt is equal to 1.602 176 634 ×10 −19 J. Hence, it has a value of one volt, 1 J/C, multiplied by the elementary charge e = 1.602 176 634 ×10 −19 C. ![]() In some older documents, and in the name Bevatron, the symbol BeV is used, which stands for billion (10 9) electronvolts it is equivalent to the GeV.Īn electronvolt is the amount of kinetic energy gained or lost by a single electron accelerating from rest through an electric potential difference of one volt in vacuum. It is commonly used with SI prefixes milli-, kilo-, mega-, giga-, tera-, peta- or exa- (meV, keV, MeV, GeV, TeV, PeV and EeV respectively). It is a common unit of energy within physics, widely used in solid state, atomic, nuclear, and particle physics, and high-energy astrophysics. Since q must be an integer multiple of the elementary charge e for any isolated particle, the gained energy in units of electronvolts conveniently equals that integer times the voltage. Historically, the electronvolt was devised as a standard unit of measure through its usefulness in electrostatic particle accelerator sciences, because a particle with electric charge q gains an energy E = qV after passing through a voltage of V. Under the 2019 redefinition of the SI base units, this sets 1 eV equal to the exact value 1.602 176 634 ×10 −19 J. ![]() When used as a unit of energy, the numerical value of 1 eV in joules (symbol J) is equivalent to the numerical value of the charge of an electron in coulombs (symbol C). In physics, an electronvolt (symbol eV, also written electron-volt and electron volt) is the measure of an amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt in vacuum. For other uses, see MEV, KEV, GEV, TEV and PEV. "meV", "keV", "MeV", "GeV", "TeV" and "PeV" redirect here. ![]()
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