CHEM 142 Lecture Notes - Lecture 2: Bohr Model, Incandescence, Electronvolt
Document Summary
Suggested problems: ch. 12 #37, 39, 41, 43, 45, 47, 141. Blackbody radiators are made of atoms, so why is their emission and absorption. Heated object will emit energy as em radiation. Max planck: experiments on light emitted from solid heated to incandescence. As temperature increases, intensity increases, peak shifts to shorter wavelengths. Planck also worked on mathematical model of characteristic bb radiation curve. Energy of particular frequency is lost in integer values. E = ( e = energy change, . Blackbody system can absorb/emit energy of given frequency only in discrete amounts. E = = (6. 626 10 -34 . Proposed quantized spectrum was due to electron moving between discrete energy states. Emitted photon appears as one of the lines in spectrum. Represents a change between two energy levels in atom. Critical idea: electron circles nucleus in only certain allowed circular orbitals.
