Its existence was first proposed in 1928 by Paul Dirac as an explanation for the existence of quantum states with negative energies.
Its existence was first proposed in 1928 by Paul Dirac as an explanation for the existence of quantum states with negative energies. This particle was first observed in 1932 by Carl Anderson. Having a positive charge and a rest mass energy equivalent of about 511 keV ["kiloelectronvolts"], it is short- lived as it rapidly annihilates with its abundant antiparticle. For 10 points, name this anti-matter particle sometimes called an anti-electron.
Its existence was first proposed in 1928 by Paul Dirac as an explanation for the existence of quantum states with negative energies.
{positron} [accept {anti-electron} until mentioned; prompt on “anti- matter” before “511 keV”]