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Heat rediation problem

  1. Jun 12, 2007 #1
    1. The problem statement, all variables and given/known data

    A small body at temperature θ is suspended in an evacuated enclosure with walls at uniform temperature θ0.If (θ-θ0) is small show that the the rate at which the body loses heat bt radiation is given by

    dQ/dt=4(θ0)^3*Aaσ(θ-θ0)
    where A is the area and a is the sbsortivity of the body.

    2. Relevant equations
    3. The attempt at a solution

    We should use the Stefan's law:Q=σ[θ^4-(θ0)^4]
    the differentiation may be carried out...But I do not understand how to replace σ
     
  2. jcsd
  3. Jun 12, 2007 #2

    hage567

    User Avatar
    Homework Helper

    [tex]\sigma[/tex] is a constant. You don't replace it with anything. :confused:
     
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