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Homework Help: Expressing entropy of black body radiation

  1. Jan 23, 2017 #1
    1. The problem statement, all variables and given/known data
    By applying the first law to a quasi static process, show that the entropy can be expressed as
    S = (16σ/3c) VT3

    2. Relevant equations
    U = 4(σ/c) VT4
    PV = 1/3 U

    3. The attempt at a solution
    I know I should be using
    dS = dQ/T but it's unclear to me how to use this unless I took the integral for arbitrary volumes, I couldn't find any examples in my text or online to try and get it myself
  2. jcsd
  3. Jan 23, 2017 #2


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    Homework Helper
    Gold Member
    2017 Award

    Hello, and welcome to PF!
    Show how you are attempting to apply the first law.
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