Absorbers, emitters, reflecting materials

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  • infra-red radiation
    • shiny surfaces
      • poorer absorbers than dull surfaces
      • poorer emitters than dull surfaces
      • better reflectors than dull surfaces
    • White surfaces
      • good reflectors
      • poor emitters
      • poor absorbers
    • Black surfaces
      • good absorbers
      • good emitters
      • poor reflectors
    • Perfect black body
      • an object that absorbs all of the radiation incident on it
      • does not reflect or transmit any radiation
      • best possible emitter


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