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Blackbody Radiation Test Question

  1. Oct 30, 2012 #1
    1. The problem statement, all variables and given/known data
    The blackbody radiation equations of state are E/V=aT^(4) and P=(1/3)(E/V). From the fundamental state derive a quantity involving only P and V that remains constant when this radiation undergoes a reversible adiabatic transformation.


    2. Relevant equations
    Maybe dE=TdS-PdV being the fundamental state?

    3. The attempt at a solution
     
  2. jcsd
  3. Oct 30, 2012 #2
    I suggest starting with
    [tex]dE = -p \; dV[/tex]
    since for an adiabatic process dS = 0. Then try to eliminate dE in favor of dp and dV.
     
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