Question

Hello
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What is the difference between Action Spectra and absorption spectra

Answer 1

From what I read, absorption spectrum refers to the set of wavelengths a molecule can absorb. Action spectrum refers to that subset of the absorption spectrum the molecule uses to perform a physiological process.

E.g. chlorophyll can absorb in the microwave part of the spectrum. But it uses only the red and blue part of the spectrum for photosynthesis.