Photosynthesis Page 2

Light Reactions of Photosynthesis

• III. Nature of Light
• A. Photon = E = hc/W
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• 1. E = quantum energy (Einsteins = joules/mole quantum)
• 2. h = Planck's constant (6.626 X 10-34 joule sec)
• 3. c = speed of light (2.998 X 108 m/sec)
• 4. W = wave length of light (350 - 720 X 10-9 m)
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• IV. Light Trapping Pigments
• A. Absorb specific wave lengths & transmit the remaining wave lengths of light.
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• B. Chlorophyll (Plants)
• 1. Chlorophyll a
• 2. Chlorophyll b
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• C. Carotenoids (Plants)
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• D. Phycobilins (Red Algae & Cyanobacteria)
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