CHEM 1000 Lecture 2: LIGHT AND LIFE 09-10-2018
Document Summary
Provides them with information about their surrounding environment a. Ex: green algae uses light to perform photosynthesis, and also uses eyespot to gather where there is the most light to move towards the light source. Sun gives off 3. 4x10^38 hydrogen nuclei/second (4 mill tons matter --> energy conversion) as electromagnetic radiation. Light: the portion of em spectrum that can be detected by human eyes. (400 -700nm). Relationship between wavelength to energy of photos is inverse. Longer the wavelength, the less energy the photos contain. Ex: red light has less energy than blue light b/c it has longer wavelength. Photon is used as a source of energy or information. The energy of photon is transferred to the electron, moving it from ground state --> excited state i. ii. Energy of photon must match amount electron needs to move from ground to excited. This energy is used for processes such as vision and photosynthesis.
