Which scientist discovered infrared radiation, in 1800, by measuring temperature just beyond the red end of the visible spectrum?

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1. Which scientist discovered infrared radiation, in 1800, by measuring temperature just beyond the red end of the visible spectrum?

William Herschel

Johann Wilhelm Ritter

Wilhelm Röntgen

Michael Faraday

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William Herschel discovered infrared radiation in 1800, after noticing a temperature rise just beyond the red end of a sunlight spectrum.