Electromagnetic Spectrum - electrons move further from the...

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Electromagnetic Spectrum Light behaves as if it were composed of "units" or "packets" of energy that travel in waves. These packets are photons . The wavelength of light determines its color. For example, The wavelength of red is about 700 nm and the wavelength of blue light is about 470 nm. Visible light is a part of a larger spectrum of radiation called the electromagnetic spectrum. Ultraviolet radiation (UV) is dangerous to cells because it breaks chemical bonds. Photosynthetic Pigments Pigments are molecules that absorb light. When a photon of light strikes a photosynthetic pigment, an electron in an atom contained within the molecule becomes excited. Energized
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Unformatted text preview: electrons move further from the nucleus of the atom. The excited (energized) molecule can pass the energy to another molecule or release it in the form of light or heat. Chlorophyll A is the main photosynthetic pigment in all organisms except bacteria. Other pigments called accessory pigments absorb slightly different wavelengths of light. The combination of all of the pigments increases the range of colors that plants can use in photosynthesis. Accessory pigments include chlorophyll b and a group of pigments called carotenoids . They do not participate directly in photosynthetic reactions but are able to pass their energy to chlorophyll a....
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