Radiation - The amount of blue or red shift tells us an...

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Radiation How does light tell us the temperatures of planets and stars? Basically everything emits thermal radiation, including stars, planets, you… An object’s thermal radiation spectrum depends on only one property: its temperature Properties of Thermal Radiation: Hotter objects emit more light at all frequencies per unit area. Hotter objects emit photons with a higher average energy. Doppler Effect How does light tell us the speed of a distant object?
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Unformatted text preview: The amount of blue or red shift tells us an object’s speed toward or away from us Doppler shift tells us ONLY about the part of an object’s motion toward or away from us Motion toward or away from an observer causes a shift in the observed wavelength of light: blueshift (shorter wavelength) -motion toward you redshift (longer wavelength) - motion toward you greater shift -> greater speed...
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This note was uploaded on 09/12/2011 for the course AST 2002 taught by Professor Britt during the Spring '08 term at University of Central Florida.

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