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| pertaining to a process that occurs within an atom; noting a particle contained in an atom, such as electrons, protons, or neutrons |
| the time required for one half the atoms of a given amount of a radioactive substance to disintegrate |
| Hall effect | |
| —n | |
| the production of a potential difference across a conductor carrying an electric current when a magnetic field is applied in a direction perpendicular to that of the current flow | |
| [named after Edwin Herbert Hall (1855--1938), American physicist who discovered it] | |
| Hall effect (hôl) Pronunciation Key
A phenomenon that occurs when an electric current moving through a conductor is exposed to an external magnetic field applied at a right angle, in which an electric potential develops in the conductor at a right angle to both the direction of current and the magnetic field. The Hall effect is a direct result of Lorentz forces acting on the charges in the current, and is named after physicist Edwin Herbert Hall (1855-1938). |