lecture3 - 5.61 F all 2007 Lecture #3 page 1 The DEMISE of...

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5.61 Fall 2007 Lecture #3 page 1 The DEMISE of CLASSICAL PHYSICS (cont’d) (a) Blackbody radiation – When heated all objects emit light! Classically: (1) Radiation from a blackbody is the result of electrons oscillating with frequency ν Oscillating charged particle antennae (2) The electrons can oscillate (& radiate) equally well at any frequency Rayleigh-Jeans Law for spectral density ρ ( ), where intensity of emitted light in frequency range from to + d is I( ) ~ ( ) d = ρν , T ) d = 8 π kT 2 d 2 ( 3 c where ( ,T ) = density of radiative energy in frequency range from to + at temperature T k = Boltzmann’s constant [= R / N A (gas constant per molecule)] c = speed of light 2 divergence at high freq. Rayleigh- ( ) Jeans Law lots of emission in UV, x-ray regions! “UV catastrophe” – not observed in exp’t ( ) Exp’t T 3 1 < 2 < 3 1 2
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5.61 Fall 2007 Lecture #3 page 2 Planck (~1900) First “quantum” ideas (1) The energy of the oscillator
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This note was uploaded on 04/14/2011 for the course CHEM 2303 taught by Professor Moh during the Spring '11 term at University of Florida.

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lecture3 - 5.61 F all 2007 Lecture #3 page 1 The DEMISE of...

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