The star betelguese has a radius and surface temperature of, Ask an Expert

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The star Betelguese has a radius and surface temperature of about 108 miles and 3000 K. The sun has a radius and surface temperature of about 5 x 105 miles and 6000 K. The ratio of the power radiated by the sun and Betelguese, PSun/PBet , is ________________. Assume the emissivity of the stars is the same. The surface area of a sphere is A=4πr².

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