The star betelguese has a radius and surface temperature of, Physics

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The star betelguese has a radius and surface temperature of

The star Betelguese has a radius and surface temperature of about 10^8 miles and 3000K. The sun has a radius and surface temp of about 5x10^5 miles and 6000k. Find the ratio of the power radiated by the sun and Betlguese Psun/Pbet . Assume the emmissivity of the stars is the same. The surface area of a sphere is A=4pir^2

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