Colour - Wavelengths, Pigments, Light
Colour - Wavelengths, Pigments, Light: According to the law of energy conservation, energy can be converted from one form to another, but it cannot be created or destroyed. Consequently, when a photon of light is absorbed by matter, usually by an atom, molecule, or ion or by a small grouping of such units, the photon disappears and its energy is gained by the matter. Similarly, when matter emits light, it loses the energy carried away by the photons. A given atom or molecule cannot emit light of any arbitrary energy, since quantum theory explains that only certain energy states are possible for a given system.
Color, the aspect of any object that may be described in terms of hue, lightness, and saturation. In physics, color is associated specifically with electromagnetic radiation of a certain range of wavelengths visible to the human eye. Learn more about color in this article.
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