Which color carries the least energy in the visible spectrum?

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Multiple Choice

Which color carries the least energy in the visible spectrum?

Explanation:
Energy per photon in light is inversely related to wavelength: longer wavelengths mean lower energy. In the visible spectrum, wavelengths run roughly from 380 nm to 750 nm. Red sits at the longest end of this range, so its photons have the smallest energy among visible colors. Violet has the shortest wavelength and thus the highest energy per photon, with blue and green in between. (Infrared would be even lower energy, but it isn’t visible.) So red carries the least energy in the visible spectrum.

Energy per photon in light is inversely related to wavelength: longer wavelengths mean lower energy. In the visible spectrum, wavelengths run roughly from 380 nm to 750 nm. Red sits at the longest end of this range, so its photons have the smallest energy among visible colors. Violet has the shortest wavelength and thus the highest energy per photon, with blue and green in between. (Infrared would be even lower energy, but it isn’t visible.) So red carries the least energy in the visible spectrum.

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