Information AboutElectronvolt |
| CATEGORIES ABOUT ELECTRONVOLT | |
| units of energy | |
|
One electronvolt is a very small amount of energy: : 1 eV = 2002 recommended values) The unit electronvolt is accepted (but not encouraged) for use with SI . It is widely used in Solid State , Atomic , Nuclear , and Particle Physics , often with SI Prefix es m, k, M, or G. USING ELECTRONVOLTS TO MEASURE MASS Einstein reasoned that energy is equivalent to (rest) Mass , as famously expressed in the formula '' E=mc&2 '' (1 kg = 90 petajoules). It is thus common in Particle Physics , where mass and energy are often interchanged, to use eV/''c''² or even simply eV as a unit of mass. (The latter is only strictly valid when working in Natural Units where '' C ''=1.) For example, an electron and a Positron , each with a mass of 0.511 MeV/c², can annihilate to yield 1.022 MeV of energy. The Proton (which is a member of the Baryon family of particles) has a mass of 0.938 GeV, making GeV a very convenient unit of mass for Particle Physics . :1 eV/c² = 1.783 kg :1 keV/c² = 1.783 kg :1 MeV/c² = 1.783 Kg :1 GeV/c² = 1.783 Kg In some older documents, one sometime encounters the symbol "BeV", which stands for "billion-electron-volt"; it is equivalent to the GeV (gigaelectronvolt). ELECTRONVOLTS AND KINETIC ENERGY For comparison:
ELECTRONVOLTS AND TEMPERATURE In certain fields, such as Plasma Physics , it is convenient to use the electronvolt as an unit of temperature. The conversion is defined using ''k'', the Boltzmann Constant . : For example, a typical Magnetic Confinement Fusion plasma is 15 keV, or 174 megakelvins. SEE ALSO EXTERNAL LINKS
> |
|
|