Lecture9 - The energy problem Early experiments Physical...

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1 Physical Chemistry Lecture 9 Introduction to Quantum Mechanics The energy “problem” Early experiments Observed only certain emission frequencies Spectra of atoms H and other atoms Colors of mineral solutions Scientists involved have very familiar names Angstrom Balmer Bunsen Fraunhofer Kirchoff Rydberg Other “problems” Planck’s theory of blackbody radiation Inferred quantization of modes of a cavity Bohr’s theory of the H atom Rejected classical electrodynamics to interpret Rydberg’s observation Quantization of energy DeBroglie’s hypothesis Quantized electron momentum to explain a variety of effects h E 2 2 1 1 m n N p Photoelectric effect Light ejects electrons from a metal plate No emission below a minimum frequency Number of electrons emitted is proportional to the intensity Electron kinetic energy Does not depend on light intensity
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Lecture9 - The energy problem Early experiments Physical...

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