# Electron Volt

Unit of energy of moving particles. Given by the kinetic energy acquired by an electron losing one volt of potential.

eV = 1.60217733x10-19J

 Kilo electron Volt (keV) = 1,000 eV Mega electron Volt (MeV) = 106eV Giga electron Volt (GeV) = 1,000,000,000 eV Tera electron Volt (TeV) = 1012eV

Electronvolts are used as a measure of the energy of cosmic rays and high-energy photons.

 Binding energy on an electron in an atom ~1 eV the photon energy of visible light 1.6 to 3.4 eV X-rays ~1000 eV (1 keV) energy-equivalent (E=mc2) of the mass of a proton ~1 GeV kinetic energy of a flying mosquito ~1 TeV

### BeV

This is sometimes used in the US to designate one billion electronvolts (109), note that this is incorrect and should be designated GeV.

### GeV

One billion (109) electronvolts. Using Einstein's equation E = mc2 equating mass to energy, the GeV can be regarded either as a unit of energy equal to 160.2176462 picojoules, or as a unit of mass equal to 1.782662x10-24 gram or 1.073544 atomic mass unit.