Vega Is Often Used as the Star to Define an Apparent

Vega is often used as the star to define an apparent magnitude of 0. Actually, the standard for 0 magnitude is the average of a group of stars including Vega. But the averaging must be done with care. If one takes the combined brightness of one 0.1-magnitude star and one -0.1-magnitude star and divides this brightness by two, the equivalent brightness is

A) one 0-magnitude star.
B) one star with a magnitude less than 0.
C) one star with a magnitude greater than 0.
D) two 0-magnitude stars.

Correct Answer:

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