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| a photon of penetrating electromagnetic radiation emitted from an atomic nucleus; electromagnetic radiation with wavelengths shorter than 1/10 of a nanometer |
| a progressive disturbance propagated in a medium without progress or advance by the points themselves, as in the transmission of sound or light |
kilogram-meter n.
A unit of energy and work in the meter-kilogram-second system, equal to the work performed by a one-kilogram force acting through a distance of one meter.