Biology 1002B Chapter Notes - Chapter 1: Electromagnetic Spectrum, Photon, Phototaxis
19 Jan 2017
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Source of energy, sustains all organisms: ex: photosynthesis. Provides organisms with information about the world that surrounds them: ex: chlamy. "s have eyespots that allows them to gather information about their location & intensity of a light source, allows optimizing light harvesting for photosynthesis. The sun converts tonnes of matter into energy, this energy is given off as electromagnetic radiation: sun generates er as a result of nuclear fusion (fusion of 2+ nuclei) of hydrogen nuclei into helium. Er travels at speed of light & reaches earth. Different types of er are distinguished by their wavelength. Range of wavelengths extending from gamma rays (shortest) to radio waves (longest, lowest energy) Wavelength light and energy of photos have an inverse relationship. Long wavelength = low energy = redder. Light causes change when it interacts with matter. This change is what allows energy of light to be used by living things.
