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| the time required for one half the atoms of a given amount of a radioactive substance to disintegrate |
| the electric or magnetic force that acts between oppositely charged bodies, tending to draw them together |
| Feynman diagram
A diagram used to help describe and visualize the possible interactions between particles in quantum electrodynamics and quantum chromodynamics. Fermions, such as electrons, are represented with straight lines and bosons, such as photons, with wavy lines. Points of intersection indicate an interaction, such as an electromagnetic interaction, between the particles. |