mercury-vapour lamp

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electric light

Overview page. Subjects: Physics.

Illumination provided by electric currents. The devices used are the arc lamp, the light bulb (incandescent filament lamp), and the fluorescent tube. In the arc lamp, which is no longer...

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ultraviolet radiation

Overview page. Subjects: Science and Mathematics — Medicine and Health.

Electromagnetic radiation which has a wavelength between 0.5 nm and 400 nm, located between the visible and X-ray regions of the electromagnetic spectrum. Near ultraviolet occurs at...

See overview in Oxford Index