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Infrared radiation was discovered in 1800 by

1. William Wollaston
2. William Herschel
3. Wilhelm Roentgen
4. Thomas Young

Correct answer: William Herschel

Solution

William Herschel discovered infrared radiation in 1800 by observing the heating effect beyond the red region of sunlight dispersed by a prism. This is a standard historical fact in the electromagnetic spectrum chapter.

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