A blue (hot) supergiant is 10 times larger in diameter than the Sun, but a red (cool) supergiant of the same luminosity has a diameter 1000 times that of the Sun. How does the surface temperature of the blue supergiant compare to that of the red supergiant?
A) They have the same luminosity, so they must have the same surface temperature.
B) The surface temperature of the blue supergiant is 10 times the surface temperature of the red supergiant.
C) The surface temperature of the blue supergiant is 100 times the surface temperature of the red supergiant.
D) The surface temperature of the blue supergiant is 1000 times the surface temperature of the red supergiant.
Correct Answer:
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