The hot glowing surfaces 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 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