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Homework Help: Thermal Radiation

  1. Nov 27, 2006 #1
    b) Real satellites are complicated objects (see photo above). To simplify the problem, suppose the satellite is a spherical black body with a 0.3 m radius. Suppose the satellite's electronics generated 3900 Watts. What would be the equilibrium temperature, Teq, of the satellite?

    Okeedoke, so I started with the equation T=oT^4. So...

    3900 J=(5.67x10^-8 W/m^2K^4)T^4

    T=(3900 J/(5.67x10^-8 W/m^2 K^4))^(1/4)

    Which gives me an incorrect answer... any hints in the right direction?
     
  2. jcsd
  3. Nov 27, 2006 #2

    Andrew Mason

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    Homework Helper

    You are given the total power but you need the power/unit area. On the Left side, divide the power by the surface area and equate that to the right side.

    AM
     
  4. Nov 28, 2006 #3
    Ah! Thanks a bunch, I got it.
     
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