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| one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences |
| the process in which energy is emitted as particles or waves, transmitted through an intervening medium or space, and absorbed by another body |
| corpuscular theory | |
| —n | |
| photon Compare wave theory the theory, originally proposed by Newton, and revived with the development of the quantum theory, that light consists of a stream of particles | |