Which colours of visible light have the shortest wavelengths and therefore the highest energy?
ARed and orange light
BYellow and green light
CViolet and blue light
DOrange and yellow light
Answer & Solution
Correct answer: C. Violet and blue light
1. White light disperses into a rainbow of colours through a prism or a drop of water.
2. Violet and blue have the shorter wavelengths and therefore higher energy.
3. Towards red the wavelengths are longer and carry lower energy.
4. Red therefore carries the least energy of the visible colours, which is the opposite end of the same rule.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.2 The Light-Dependent Reactions of Photosynthesis_
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