Within visible light, which colour carries the least energy?
ARed light
BBlue light
CViolet light
DGreen light
Answer & Solution
Correct answer: A. Red light
1. Energy and wavelength run in opposite directions across the spectrum.
2. Violet and blue have shorter wavelengths and therefore higher energy.
3. Red has the longest wavelength and carries the least amount of energy.
4. So the low-energy end of visible light is red.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 8 'Photosynthesis', sections 8.1-8.3_
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