Understudy definition, to learn (a role) in order to replace the regular actor or actress when necessary. See more.
Radiation. radiation. (Science: radiobiology) propagation of energy through space. In the context of this report, it is electromagnetic radiation (x-rays or gamma rays) or corpuscular radiation (alpha particles, electrons, protons, neutrons) capable of producing ionisation.adiation. radiation. (Science: radiobiology) propagation of energy through space. In the context of this report, it is electromagnetic radiation (x-rays or gamma rays) or corpuscular radiation (alpha particles, electrons, protons, neutrons) capable of producing ionisation.
Radiation is the final form of movement of heat energy. The sun's light and heat cannot reach us by conduction or convection because space is almost completely empty. There is nothing to transfer the energy from the sun to the earth. The sun's rays travel in straight lines called heat rays. When it moves that way, it is called radiation.