Wavelength

Definition

Wavelength is the distance between successive crests of a wave, typically measured in nanometers (nm) for light waves. It determines the color of light and plays a crucial role in photosynthesis by influencing which wavelengths are absorbed by pigments.

5 Must Know Facts For Your Next Test

1. Chlorophyll primarily absorbs light in the blue (around 450 nm) and red (around 680 nm) regions of the spectrum.
2. Different pigments absorb different wavelengths, allowing plants to maximize energy absorption from sunlight.
3. The efficiency of photosynthesis can vary depending on the wavelength of light, with blue and red light being most effective.
4. Photons with shorter wavelengths (blue light) have more energy than those with longer wavelengths (red light).
5. Wavelengths that are not absorbed by chlorophyll are reflected or transmitted; this is why plants appear green.

Review Questions

• Which wavelengths of light does chlorophyll primarily absorb?
• Why do plants appear green in terms of wavelength?
• How does the energy level of photons relate to their wavelength?

Related terms

Photon: A quantum of electromagnetic radiation that carries energy proportional to its wavelength.

Chlorophyll:

The main pigment in plants that absorbs light for photosynthesis, primarily absorbing blue and red wavelengths.

Spectrum: The range of different wavelengths of electromagnetic radiation, including visible light used in photosynthesis.