The source of ultraviolet light is:

electric bulb

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red hot iron ball

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sodium vapour lamp

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carbon arc-lamp

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Solution

The correct option is D carbon arc-lamp
Sunlight is the greatest source of UV radiation. Man-made ultraviolet sources include several types of UV lamps, arc welding, and mercury vapour lamps.there are some devices emitting UV Radiation which is Carbon, xenon and other arcs.
So, one of the source of ultraviolet light is carbon arc-lamp.

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The source of ultraviolet light is :

(a) electric bulb (b) red hot iron ball

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