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History 181B:  Modern Physics 
Class 14 (2/16/01) 
The quantum:  Planck on radiation
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Outline Transforming classical physics:  a story with mythical dimensions

Light emission and radiation
     Theoretical interest:  EM, thermo and stat mech
     Practical interest:  electrical standards
     Some basic vocabulary
     Spectra:  discrete and continuous

Studying the continuous spectrum
     Relating emission and absorption, universality
     What is a black body, and where can we find one?
     Thermodynamic successes

Names and terms 
Primary Secondary
Max Planck (1858-1947), NP 1918
 Imperial Physical-Technical Institute (PTR)
wavelength (l), frequency ( f or n)
n = c/l  (c is the speed of light)
cavity radiation
Wien distribution law
Wilhelm Wien (1864-1928), NP 1911
Stefan-Boltzmann law:  energy ~ T4
 
Copyright © Cathryn Carson 2001