Summary Concept (8.2)

Light Energy and Pigments

• Sunlight is a form of electromagnetic energy.
• The distance between two adjacent waves is called a wavelength.
• The long wavelengths of radio waves is called the electromagnetic spectrum.
• Shorter wavelengths have more energy than longer wavelengths.
• A substance's color is due to the chemical compounds called pigments.
• Paper chromatography is a method used to observe different pigments in a green leaf.
• Within the thylakoid membrane, chlorophyll and other molecules are arranged into clusters called photosystems.