Sources of Light

Light is a form if radiant energy the eye can detect, the speed of light is  3×108 m/s. There are 2 types of light that we can detect Luminous and Non-Luminous. Luminous is something that produces its own light, example Sun. Non-Luminous is something that does not produces light but reflects it, example Moon.

Luminous

(1) Incandescence

– The production of light as a result of high temperature

(2) Electric Discharge

– the process of producing light by passing an electric current through a gas

(3) Phosphorescence

– the process of producing light by absorption of UV light

(4) Fluorescence

– The immediate emission of visible light as a result of absorption of UV light.

(5) Chemiluminescence

–  the direct production of light as a result of a chemical reaction with little or no heat.

(6) Bioluminescence 

– Chemiluminescence in a living organism

(7) Triboluminescence 

– the production of light from friction

(8) LED

– Light producing from an electric current flowing through a semiconducter

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