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7.6 Visible Radiation Drives Light Reactions. -Sunlight is a type of energy called radiation , or electromagnetic energy . -Electromagnetic energy travels in space as rhythmic waves. -The distance between the crests of two adjacent waves is called wavelength . .
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7.6 Visible Radiation Drives Light Reactions
-Sunlight is a type of energy called radiation, or electromagnetic energy. -Electromagnetic energy travels in space as rhythmic waves. -The distance between the crests of two adjacent waves is called wavelength.
-Light-absorbing molecules called pigments, built into the thylakoid membranes, absorb some wavelengths of light and reflect or transmit other wavelengths. -When we look at a leaf we only see the green wavelengths that are reflected by the pigments.
-Different pigment absorb light of different wavelengths, and chloroplasts contain several kinds of pigments. Pigments appear the color they reflect. -Chlorophyll a: absorbs blue-violet and red reflects green -Chlorophyll b: absorbs blue and orange reflects yellow-green -Carotenoids: absorbs blue-green reflects yellow-orange
-A photon is a fixed quantity of light energy, and the shorter the wavelength, the greater the energy. -Each type of pigment absorbs certain wavelengths of light because it is able to absorb the specific amounts of energy in those photons.
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Answers • Radiation • Distance • Green • As electromagnetic waves • Pigments are located in the chloroplasts and they absorb the light of different wavelengths