Radiation is everywhere. Life would not exist on Earth without radiation from the sun. Additionally, many important technological activities are based on radiation, such as radio and telecommunications. Another type of radiation is used for producing...

flow of atomic and subatomic particles and of waves, such as those that characterize heat rays, light rays, and X rays. All matter is constantly bombarded with radiation of both types from cosmic and terrestrial sources. This article delineates the...

Radiation has two meanings in physics. The first refers to propagating energy, and sometimes to the energy itself. An example is a light wave--its photons each have energy. The second meaning is the process of a body emitting energy, as in a pipe...

The term radiation broadly applied to a class of physical phenomena that share a characteristic loss of energy in the radiating body or system that results in a propagation of particles and/or waves that carry the ability to do work and thus change the...

Process by which energy is emitted from a source and propagated through the surrounding medium, or the energy involved in this process. Radiation consists of a flow of atomic or subatomic particles or of waves. Familiar examples are light (a form of...

(1) Transfer of heat through electromagnetic waves from hot to cold. (2) Electromagnetic waves of energy having frequency and wavelength. The shorter wavelengths (higher frequency) are more energetic. The electromagnetic spectrum is comprised of gamma...

Radiation, as used in physics, is energy in the form of waves or moving subatomic particles. Radiation can be classified as ionizing or non-ionizing radiation, depending on its effect on atomic matter. The most common use of the word "radiation" refers...