1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

    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


    User Avatar
    Homework Helper

    [tex]\sigma[/tex] is a constant. You don't replace it with anything. :confused:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook