The hot glowing surlacas of stars emit energy in the form of electromagnetic radiation. It is a good approximation to assume that the emissivity e is equal to 1 for these surfaces. Part A Find the radius RRigel of the star Fligel, the bright blue star in the constellation Orion that radiates energy at a rate of 2.7 x 1031 W and has a surface temperature of 11,000 K. Assume that the star is spherical. Use 0' = 5.67 x 103 Vii/1:12 - K\"1 for the Stefan-Boltzmann constant and express your answer numerically in meters to two signicant figures. You did not open hints for this part. ANSWER: RRigel = i to Part B Find the radius RProcyonB of the star Procyon B, which radiates energy at a rate of 2.1 X 1023W and has a surface temperature of 10,000 K. Assume that the star is spherical. Use cr = 5.67 x 108 Vii/1112 - K4 for the Stefan-Boltzmann constant and express your answer numerically in meters to two significant figures. ANSWER: RPmcyonB = :J m