Suppose You See Two Main-Sequence Stars of the Same Spectral

question 130

Multiple Choice

Suppose you see two main-sequence stars of the same spectral type.Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100.What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas. )

• A)Without first knowing the distances to these stars,you cannot draw any conclusions about how their true luminosities compare to each other.
• B)The luminosity of Star 1 is a factor of 100 less than the luminosity of Star 2.
• C)Star 1 is 100 times more distant than Star 2.
• D)Star 1 is 100 times nearer than Star 2.
• E)Star 1 is 10 times more distant than Star 2.

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