BIOL 1000 Lecture Notes - Lecture 18: Claude Monet, Green Algae, Phytochrome
16 May 2016
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Document Summary
Claude monet suffered from cataracts saw the world in a yellow tint. Light is a source of energy and provides organisms with information about the physical world that surrounds them (ex. Green algae is a single celled photosynthetic eukaryote found in ponds/lakes. Each cell also contains a light sensor called an eyespot. The wavelength of electromagnetic radiation ranges from less than 1 picometre (cosmetic waves) to 1 kilometre (radio waves) Light: part of the electromagnetic spectrum that humans can detect with their eyes. Around 400 to 700 nm (very narrow) Light is composed of energy packets called photons. Longer wavelength = lesser energy of the photons. Photons penetrate, get absorbed or are reflected when they hit an object. For energy/info purposes, it must be absorbed by an organism. Absorption happens when photon energy is transferred to an electron, exciting it. This can only happen when the energy difference from ground to excited is the same.
