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Why is a rough surface a good absorber and radiator of infrared?

  1. Apr 17, 2010 #1
    Why is a rough surface a good absorber and radiator of infrared?
     
  2. jcsd
  3. Apr 17, 2010 #2
    Because it's total "surface area" is increased.
    But that's a simple answer which may not apply in all cases.
     
  4. Apr 17, 2010 #3

    mgb_phys

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    Because an incoming photon is reflected more times on a rough surface and so the chances of it being absorbed are higher.
     
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