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| the time required for one half the atoms of a given amount of a radioactive substance to disintegrate |
| energy transmitted in wave motion, especially electromagnetic wave motion |
| baryon (bār'ē-ŏn') Pronunciation Key
Any of a family of subatomic particles composed of three quarks or three antiquarks. They are generally more massive than mesons, and interact with each other via the strong force. Baryons form a subclass of hadrons and are subdivided into nucleons and hyperons. Protons and neutrons are baryons. See Table at subatomic particle. |