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: 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

    User Avatar
    Science Advisor
    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.

  4. Nov 28, 2006 #3
    Ah! Thanks a bunch, I got it.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook