MasteringAstronomy - Light from a warm body • Any warm...

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For Mastering Astronomy D=r x t Speed of light = 2.97 x 10^8 m/s Look up mastering astronomy values Photosphere We observe the Sun’s atmosphere The sun’s atmosphere has 3 layers Lowest layer is the photosphere: layer we “see’ o Produces visible light Just above the photosphere is the chromosphere o Ultraviolet light o Can’t visible see it, can only detect during solar eclipses Above the chromosphere is the corona o UV/X-ray radiation Photosphere Source of most of the radiation that reaches the Earth (8 minute flight time) Radiation from the photosphere illuminates the earth’s surface and the disk of the other bodies in the solar system Photosphere emits most of its radiation as optical light
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Unformatted text preview: Light from a warm body • Any warm body in “thermal equilibrium” (not heating up or cooling down) emits radiation like a black body according to this theoretical intensity curve • Curve describes intensity vs. wavelength o Can see Characterisitic shape: sudden rise at short wavelength and gradual decline at larger wavelength Curves at 12,000, 10,000 and 8,000 degree curves As you heat an object and it comes into equilibrium at larger temperature, the radiation has shorter wavelengths • The sun is a black body o Temp of photosphere: 5800 K This temperature peaks within the visible band Only thin slice of entire EM spectrum...
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This note was uploaded on 03/16/2011 for the course ASTRO 2 taught by Professor Corcoran during the Spring '11 term at GWU.

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