The Brightness Of Stars
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The Brightness Of Stars
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On a particular night, the planet Mars has an angular diameter of 15 arcsec and an apparent brightness of 1.0 ×10^-7 Wm^-2 . Two astronomers observe the planet, using identical C C D cameras whose pixels are 25 μm apart. Albert uses a telescope of 0.3 m aperture whose focal ratio is f / 8 . Bertha uses a telescope of 30 m aperture whose focal ratio is f / 4 . How much energy accumulates in a single pixel of Albert's CCD image of Mars in a 100 s exposure? How much in a single pixel of Bertha's im
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