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  1. P

    Blackbody radiation text

    So what exactly is the difference between (a) a hot gold ingot; and (b) the Sun? Why is one a blackbody, but the other isn't? How can they "measure" or "determine" that the Sun absorbs 100% of the radiation incident upon it? What kind of experiments do they do to confirm this?
  2. P

    Blackbody radiation text

    OK, but that's the part I don't get.. The Sun isn't black.. Nor is a red hot oven black. Does the use of the term "black" here have nothing to do w/ the actual color of the object?
  3. P

    Blackbody radiation text

    So this is something that had always been a bit of a stumbling block for me, but I think I'm starting to grasp it .. at least partially. What we really have going on is two distinct bodies: (a) the "radiator" itself, which might be the walls of an oven (i.e., the actual "solid" object that...
  4. P

    Blackbody radiation text

    So "black body" radiation really means "cavity" radiation? That was my next question.. Why is the glowing red heat from an oven called "black" body radiation? :-)
  5. P

    Blackbody radiation text

    I'm reading from an introductory text on quantum physics, and came across this sentence: It's the second sentence that I don't understand: how can the energy in the EM field be responsible for the ability of a hollow cavity to absorb heat?
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