Two Stars Have the Same Luminosity (Or Absolute Magnitude)

Two stars have the same luminosity (or absolute magnitude) . One star is spectral class B and the other is spectral class K. From this information, one knows that the

A) K-type star is larger than the B-type star.
B) B-type star is larger than the K-type star.
C) B-type star is hotter but can be larger, smaller, or the same size as the K-type star.
D) K-type star is hotter but can be larger, smaller, or the same size as the B-type star.

Correct Answer:

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