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OpenStudy (anonymous):
A main sequence star emits most of its energy at a wavelength of 2.42*10^-7 m. Its apparent brightness is measured to be 8.56*10^-12 Wm^-2 a)find stars surface temperature b)what is stars luminosity in solar luminousity c)find the ratio of distance of this star and earth to ratio of distance between sun and earth
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