The Red Giant Betelgeuse The red giant Betelgeuse has a surface temperature of 3000 K and is 600 times the diameter of our sun. (If our sun were that large, we would be inside it!) Assume that it radiates like an ideal blackbody.
(a) If Betelgeuse were to radiate all of its energy at the peak-intensity wavelength, how many photons per second would it radiate?
(b) Find the ratio of the power radiated by Betelgeuse to the power radiated by our sun (at 5800K).