GPHY 314 Study Guide - Quiz Guide: Photon, Shortwave Radiation, Tungsten
29 Dec 2020
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Internal energy: how fast the atoms and molecules in the object are moving. If water molecules moving slowly in one glass, it has less internal energy than water moving on other glass. If temperature doubles from 200 to 400k, internal energy also doubles: 0k is absolute zero -> temperature at which molecules have zero internal energy and cease moving; coldest possible temperature. 300k blackbody occurs near 10 micron: first figure also shows that the peak of emissions spectrum for, objects do not just emit photons at max -> emit them over a range of wavelengths around that. Electromagnetic radiation: law of thermodynamics says that energy is conserved. If some object loses energy, some other energy must gain that same amount. If a photon hits an object and is absorbed, the energy of the photon is transferred to the object"s internal energy and the object warms.
