Lower Expression: Modern diplomacy and politics. Gamma ray definition, a photon of penetrating electromagnetic radiation (gamma radiation ) emitted from an atomic nucleus. … Crepuscular rays, shafts of light which are seen just after the sun has set and which extend over the western sky radiating from the position of the sun below the horizon. Higher Expression: The science of statesmanship, of government. Learn more. Gamma rays are produced in the disintegration of radioactive atomic nuclei and in the decay of certain subatomic particles. It includes some overlap with X-rays in the electromagnetic spectrum. Ultraviolet definition, beyond the violet in the spectrum, corresponding to light having wavelengths shorter than 4000 angstrom units. One of the most obvious examples is a sun's ray of light in space. Perhaps the words of great servers can add a human dimension to the quality of particular rays. Ray, any of the cartilaginous fishes of the order Batoidei, related to sharks and placed with them in the class Chondrichthyes. Rays are distinguished from sharks by a flattened, disklike body, with the five gill openings and the mouth generally located on the underside. incident ray definition: 1. in physics, a ray of light that hits a surface 2. in physics, a ray of light that hits a surface. The ray that bounces off the surface at an angle is known as the reflected ray. They form only when the sun has set behind an irregularly shaped cloud or mountain which lets the rays of … Gamma ray, electromagnetic radiation of the shortest wavelength and highest energy. Ray: Definition and Examples A ray is a line with an endpoint that extends infinitely in one direction. Refracted rays are when the light goes through the surface, bending due to the change of material (or 'medium'). The angle of incidence is the angle between the incident ray and the normal (the dotted line at 90 degrees to the surface). See more. See more. That mass difference is converted into energy, according to Einstein's famous equation E=mc^2, with about two-thirds of that energy emitted as gamma-rays. ray, in physics, term denoting the straight line along which light [1] or other form of radiation is propagated from its source.