Lecture16

Lecture16 - PHY102 1 Major Concepts in Physics Lecture 16....

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Unformatted text preview: PHY102 1 Major Concepts in Physics Lecture 16. Prof Simon Catterall Office 309 Physics, x 5978 smc@physics.syr.edu http://physics/courses/PHY102.08Spring PHY102 So far Prior to 20 th century: Mechanics (Newton) Electromagnetism (Faraday, Maxwell) Thermodynamics (Boltzmann, Gibbs) classical physics 20th century saw 2 dramatic revolutions Relativity Quantum Mechanics experiments on atoms PHY102 A crisis Turn of 19 th century series of experiments produced unanticipated results which were completely incompatible with classical physics Blackbody radiation Structure of atoms Photoelectric effect . PHY102 Blackbody curves We have seen that thermal radiation is emitted with a distribution of intensity which depends on frequency Wiens law tells us how the peak moves with frequency, Stefan what the total amount of emitted radiation is Curves were determined very accurately via experiments PHY102 . PHY102 Ultraviolet catastrophe Unfortunately classical physics was not able to account for the shape of these curves f E(f) E(f)=cf 2 Total radiation emitted = infinite! PHY102 To correctly explain the shape of the blackbody spectrum Planck (1900) proposed that the energy absorbed or emitted...
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Lecture16 - PHY102 1 Major Concepts in Physics Lecture 16....

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