Fluorescence
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Fluorescence is one of two kinds of emission of light by a substance that has absorbed light or other electromagnetic radiation. Fluorescence involves no change in electron spin multiplicity and generally it immediately follows absorption; phosphorescence involves spin change and is delayed. Thus fluorescent materials generally cease to glow nearly immediately when the radiation source stops, while phosphorescent materials, which continue to emit light for some time after.
Fluorescent minerals emit visible light when exposed to ultraviolet.
Fluorescent marine organisms
Fluorescent clothes used in black light theater production, Prague
A cup made from the wood of the narra tree (Pterocarpus indicus) beside a flask containing its fluorescent solution Lignum nephriticum.
Electromagnetic radiation
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In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field, which propagate through space and carry momentum and electromagnetic radiant energy. Types of EMR include radio waves, microwaves, infrared, (visible) light, ultraviolet, X-rays, and gamma rays, all of which are part of the electromagnetic spectrum.
