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Light scattering and thermal emission of a body

  1. Dec 21, 2012 #1
    hi All,

    We know from QM that black bodies at temperature T emits light in a well stabilished patern.
    Now what if the body has color? Which is the emission patern of a green snooker ball for example, at temperature T?

    When scattering white light we see this ball green because it absorbs everything but this range of frequencies near the green. Is there any universal relationship between the absorption spectrum and this thermal emission spectrum?

    Best regards, Merry Xmas,

  2. jcsd
  3. Dec 22, 2012 #2


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    Staff: Mentor

    Both spectra are the same. If you heat a ball which reflects most green light, it will emit less green light than a black body.
  4. Dec 22, 2012 #3
    So is the spectrum like the figure attatched? If so, would you have some reference to recomend?

    Best wishes,


    Attached Files:

  5. Dec 22, 2012 #4
    It seems reasonable to think that two snooker balls, one made of iron and the other made of coper, but both painted with green tincture will exhibt the same emission spetrum.

    It is correct?

    Best wishes

  6. Dec 22, 2012 #5


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    Staff: Mentor

    Our eyes are not spectrometers, there are many ways we can perceive light as green. That spectrum would be a possibility, at least in theory.
    Books about electrodynamics and the interaction of light with matter should cover this somewhere.
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