(Answered) Star a and star b have the same apparent magnitude but star

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Star A and star B have the same apparent magnitude, but star B is twelve times further away than star A. How much more luminous is star B than star A? Suppose that star B also only has half the surface temperature of star A, what is the energy flux from the surface of star B compared to star A? What is the ratio of the radius of star B over the radius of star A.

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