annihilation radiation

annihilation radiation

noun Physics.
electromagnetic radiation produced by the coalescence and mutual annihilation of a positron and an electron, each pair forming two photons having a minimum energy of 0.5 million electron volts each.

Origin:
1960–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Annihilation radiation is always a great word to know.
So is joule. Does it mean:
a unit of energy, the work done by a force of one newton when its point of application moves through a distance of one meter in the direction of the force
the property of a fluid that resists the force tending to cause the fluid to flow; the measure of the extent to which a fluid possesses this property
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