Multiple choice

Who discovered infra-red radiation?

  1. Ptolemy

  2. William Herschel

  3. Max Planck

  4. Albert Einstein
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sir William Herschel discovered infrared radiation in 1800 by using a prism to refract sunlight and measuring the temperature increase just beyond the red end of the visible spectrum. This proved the existence of invisible light.

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