l7 - This week and next Review Interpreting Planck Light...

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Unformatted text preview: This week and next Review Interpreting Planck Light The electron Photoelectric effect Einstein and light Rayleigh scattering Blue sky This week and next Today (Tuesday, Sep. 22) and this Thursday (Sep. 24): blackbody radiation, photoelectric effect, Compton scattering, X rays, and x-ray diffraction. Tomorrow (Wednesday, Sep. 23): recitation on homework 3. Homework due as usual on Friday, Sep. 25. Tuesday, Sep. 29: no class (the University follows a Monday class schedule), and no office hours. Also no labs on Sep. 28 or Sep. 30. Wednesday, Sep. 30: no recitation. I will be responding to emails all week, and available by Skype ( cjjxray ) this day from 4:15 pm til 5 pm. Thursday, Oct. 1: exam on material of Serway chapters 13, and homeworks 13. Ill be leaving at noon on Friday, Sep. 25 and returning on Sunday, Oct. 4 (Synchrotron Radiation Instrumentation conference in Melbourne, Australia: www.sri09.org ) This week and next Review Interpreting Planck Light The electron Photoelectric effect Einstein and light Rayleigh scattering Blue sky Dr. Carolyn Porco Todays New York Times has an article on Dr. Carolyn Porco, who heads the imaging team of the Cassini mission to Saturn. Dr. Porco received her bachelors degree in astronomy at Stony Brook. Dr. Carolyn Porco The Cassini imaging team The article: http://www.nytimes.com/2009/09/22/science/space/22prof.html This week and next Review Interpreting Planck Light The electron Photoelectric effect Einstein and light Rayleigh scattering Blue sky Fragments of thermodynamics Entropy R ( E ) is the logarithm of the number of available states as a function of energy E . The inverse of temperature measures the degree to which entropy changes as the energy in the system is changed but the number of particles N remains fixed: 1 parenleftbigg U parenrightbigg N This is scaled into an absolute temperature T in Kelvin via Boltzmanns constant k B , so that = k B T . k B = ( 1 . 381 10- 23 Joules/Kelvin)= ( 8 . 617 10- 5 eV/K) k B T = ( 1 / 40 ) eV at room temperature The relative likelihood that a system with temperature T will wind up in a particular state with energy E is given by the Maxwell-Boltzmann distribution function which is exp [ E / k B T ] . This week and next Review Interpreting Planck Light The electron Photoelectric effect Einstein and light Rayleigh scattering Blue sky Blackbody radiation How hot is white hot? Red hot? Precise measurements show a discrepancy with semiclassical theories mainly in the infrared (Heinrich Rubens, Universitaet Berlin). On Sunday, Oct. 7, 1900, Rubens visits his colleague Max Planck, who comes up with a calculation that works based on E = nh ....
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l7 - This week and next Review Interpreting Planck Light...

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