Which of the following is/are the source/s of ultraviolet radiations?

The sun

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Electric arcs of mercury

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Discharges in hydrogen

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All of these

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Solution

The correct option is D All of these
$\begin{matrix} Natural source of UV radiation is Sun. Where as artificial Sources are Black (lights, short wave \end{matrix}$
$\begin{matrix} UV lamps, Electric arc's, gas discharges, uv lasers, UV LEDS etc. \end{matrix}$

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