Sources of Light.

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Presentation transcript:

Sources of Light

Incandescent Light The production of light as a result of high temperatures ie. burner on a stove, candle and incandescent light bulb

Electric Discharge Produced by an electric current passing through a gas ie. Iightning, neon gas (red light)

Phosphorescence Producing light by absorbing ultraviolet light (UV) resulting in the emission of visible light over an extended period of time ie. glow in the dark materials (coated with phosphors)

Fluorescence An object absorbs ultraviolet light and immediately releases the energy as visible light ie. fluorescent lights (tube is filled with mercury vapour, the electrical current causes the mercury atoms to emit UV light), detergents, highlighters, use fluorescent dyes to brighten

Chemiluminescence The direct production of light as the result of a chemical reaction with little or no heat produced ie. glow stick

Bioluminescence the production of light in living organisms as the result of a chemical reaction with little or no heat produced ie. firefly (chemical reaction of oxygen & luciferin, a substance in the lower abdomen)

Triboluminescence Production of light when certain crystals are scratched, crushed or rubbed ie. Quartz

Light Emitting Diode LED Light production as a result of an electric current flowing in semi-conductors (flows in one direction) This does not produce much heat as a by-product and is more energy efficient ie. Christmas lights, traffic lights

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