Ch27_part1

Ch27_part1 - Chapter 27, Part 1 PHY213 Need for Quantum...

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Chapter 27, Part 1 PHY213 1 Chapter 27 Quantum Physics Need for Quantum Physics s Problems remained from classical mechanics that relativity didn’t explain s Blackbody Radiation s ( we won’t study except to introduce where E=h f came from ) s The electromagnetic radiation emitted by a heated object s Photoelectric Effect s Emission of electrons by an illuminated metal s Spectral Lines s Emission of sharp spectral lines by gas atoms in an electric discharge tube Development of Quantum Physics s 1900 to 1930 s Development of ideas of quantum mechanics s Also called wave mechanics s Highly successful in explaining the behavior of atoms, molecules, and nuclei s Involved a large number of physicists s Planck introduced basic ideas s Mathematical developments and interpretations involved such people as Einstein, Bohr, Schrödinger, de Broglie, Heisenberg, Born and Dirac Blackbody Radiation Graph s Experimental data for distribution of energy in blackbody radiation s As the temperature increases, the total amount of energy increases s Shown by the area under the curve s As the temperature increases, the peak of the distribution shifts to shorter wavelengths
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Chapter 27, Part 1 PHY213 2 The Ultraviolet Catastrophe s Classical theory did not
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Ch27_part1 - Chapter 27, Part 1 PHY213 Need for Quantum...

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