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Question

Infrared radiation was discovered in 1860  by


A
William Wallaston
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B
William Herschel
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C
William Roentgen
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D
Thomas Young
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Solution

The correct option is D William Herschel
Herschel was testing filters for the sun so he could observe sun spots. When using a red filter he found there was a lot of heat produced. Herschel discovered infrared radiation in sunlight by passing it through a prism and holding a thermometer just beyond the red end of the visible spectrum.This thermometer was meant to be a control to measure the ambient air temperature in the room. He was shocked when it showed a higher temperature than the visible spectrum. Further experimentation led to Herschel's conclusion that there must be an invisible form of light beyond the visible spectrum.

Physics

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