Which one of the following types of radiations has the smallest wave-length ?
Microwaves
Infra-red
Visible light
X-rays
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UPSC NDA-2 – 2020
Electromagnetic radiation is ordered by wavelength and frequency in the electromagnetic spectrum. The spectrum, from longest wavelength (lowest frequency) to shortest wavelength (highest frequency), includes Radio waves, Microwaves, Infra-red, Visible light, Ultraviolet, X-rays, and Gamma rays. Among the given options, X-rays have the shortest wavelength.