What are ultraviolet rays ??
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Explanation:
Ultraviolet is a form of electromagnetic radiation with wavelength from 10 to 400 nm, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.
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Explanation:
ultraviolet rays. electromagnetic radiation beyond the violet end of the visible spectrum (at 0.39 to 0.18 μm wavelength) and therefore not visible to humans. They are produced by the sun but are absorbed to a large extent by particles of dust and smoke in the earth's atmosphere.
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