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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PHY213
2
The Ultraviolet
Catastrophe
s
Classical theory did not
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 Summer '08
 Cao
 Physics, mechanics, Energy, Quantum Physics, Photon, Radiation, Max Planck, blackbody radiation

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