The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation. It is a good approximation to assume tha

t the emissivity e is equal to 1 for these surfaces. Part A Find the radius RRigel of the star Rigel, the bright blue star in the constellation Orion that radiates energy at a rate of 2.7×1031W and has a surface temperature of 11,000 K. Assume that the star is spherical. Use σ=5.67×10−8W/m2⋅K4 for the Stefan-Boltzmann constant and express your answer numerically in meters to two significant figures. RRigel = 5.1×1010 m SubmitHintsMy AnswersGive UpReview Part Correct This is over 50 times the size of our own sun and about a third of the orbital radius of the earth around the sun. Rigel is an example of a supergiant star. Part B Find the radius RProcyonB of the star Procyon B, which radiates energy at a rate of 2.1×1023W and has a surface temperature of 10,000 K. Assume that the star is spherical. Use σ=5.67×10−8W/m2⋅K4 for the Stefan-Boltzmann constant and express your answer numerically in meters to two significant figures. RProcyonB = 1.61•1011 m