Black Bodies - light all visible colors o Light produced by...

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Blackbody Radiation Very hot inner parts emit continuous radiation (continuum) Cooler outer layers absorb certain wavelengths – how we derive chemical composition The Doppler Effect o Can use to determine the radial velocity of an object Speed toward or away from us o When dealing with light, only the relative motion matters Either the emitter or observer could be moving o Blue Shift – Object moving towards you, wavelength gets shorter Called blue shift because blue waves are shorter o Red Shift- Object moving away from you, wavelength gets longer Red because red waves are longer o QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. o speed it is moving towards us/ speed of light o Doppler shift due to stellar wobble Planet would be tugging on a star, allows us to see extra-solar planets o Hot stars are blue o Cold Stars are red o Medium temp. stars appear white because they emit similar amounts of
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Unformatted text preview: light all visible colors o Light produced by jiggling of electrons Hotter it is the faster they move Constantly emitting light, faster they move the higher energy light they produce Blue = higher energy o Coals red because it produces red as well as infrared why you can feel the heat Ice- reflecting blue, not producing blue Black Bodies o Ignoring the absorption lines, the spectrum resembles that of a black body perfect absorber and emitter- no reflected or transmitted light o QuickTime^ and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime TIFF (LZW) are needed to s- Stephan- Boltzmann Law sigma = constant If planets have the same surface area, you can just take the ratio of the temperatures (6000/3000)^4...
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Black Bodies - light all visible colors o Light produced by...

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