UVCatPost - The Three Basic Types of Spectra

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http://ircamera.as.arizona.edu/astr_250/images/spectra.jpg The Three Basic Types of Spectra
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Kirchhoff’s Laws of Radiation Morrison: FRONTIERS OF ASTRONOMY, c 1990 by Saunders College Publishing
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Thermal (Black-body) Radiation - ideal continuum source - absorbs all incident radiation & reflects none - perfectly efficient radiator - “model” for incandescant solid, liquid, high density plasma
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Hole in wall of hollow cube (cavity) is a black-body to good approximation. Hole in wall http://rugth30.phys.rug.nl/quantummechanics/_derived/ black_body.htm_txt_CAVITY.gif Light from outside goes through hole and is trapped (absorbed) inside, not reflected.
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Prism or Diffraction Grating Screen When cube is heated, the hole glows more intensely (efficiently) than the walls.
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Analysis of the light from the hole, shows that the spectrum has a very distinctive energy curve. Prism or Diffraction Grating Screen
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Thermal (Black-body) Radiation Curves
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http://encyclopedia.laborlawtalk.com/wiki/images/thumb/9/95/303px-Blackbodygraph.png Classical theories of heat failed to derive the shape of the black-body radiation curve.
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This note was uploaded on 04/17/2008 for the course PHYSICS 135-3 taught by Professor Brown during the Spring '08 term at Northwestern.

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UVCatPost - The Three Basic Types of Spectra

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