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Astronomers observe a star that exhibits a black body emission spectrum with the maximum radiative emission...

Astronomers observe a star that exhibits a black body emission spectrum with the maximum radiative emission occurring at a wavelength of 500 nm.
a. what is the surface temperature of this Star?
b. how large is the radiated power of the star if it's area has been measured to be 6.16x10^18 m^2? hint: a=5.67x10^-8 Wm^-2 K^-4

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