the graphic representation of the strength and direction of electromagnetic radiation in the vicinity of a transmitting aerial Also called antenna pattern
- Radiation physics
noun a branch of physics concerned with the effects of radiation, esp. from space Examples Radiation physics is the study of ionizing radiation and its effects on matter. Word Origin 1936
- Radiation poisoning
noun a systemic condition caused by excessive exposure to radiation, as from a nuclear explosion or accident; also called radiation sickness Examples The severity of symptoms and sickness in radiation poisoning depend on the amount and length of exposure. Word Origin 1947
noun, Physics. 1. the potential in volts that must be applied to an atom or molecule to cause it to emit radiation at one of its characteristic frequencies.
noun, Physics. 1. the pressure exerted on a surface by electromagnetic radiation or by sound waves. radiation pressure Force per unit area exerted by waves or particles of radiation, especially photons. Though photons have no mass, they do have momentum, and can transfer that momentum to other particles upon impact. The amount of pressure exerted […]