Vega Is Often Used as the Star to Define an Apparent

question 113

Multiple Choice

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.

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