Absorption spectrum

Definition

An absorption spectrum is a graph showing the wavelengths of light absorbed by a pigment. It indicates specific wavelengths that are absorbed by molecules, such as chlorophyll, during photosynthesis.

5 Must Know Facts For Your Next Test

1. Chlorophyll a and b have distinct absorption peaks in the blue and red regions of the spectrum.
2. The absorption spectrum is crucial for understanding which wavelengths of light drive photosynthesis most effectively.
3. Accessory pigments like carotenoids expand the range of light wavelengths that can be used in photosynthesis.
4. The absorption spectrum can be measured using a spectrophotometer.
5. The green color of leaves results from chlorophyll reflecting green light, which is not absorbed.

Review Questions

Related terms

Chlorophyll:

A green pigment found in plants that absorbs light to provide energy for photosynthesis.

Spectrophotometer: An instrument used to measure the intensity of light at different wavelengths.

Carotenoids: Accessory pigments in plants that absorb blue and green light, expanding the range of usable light.