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Star C and Star D Are Equally Luminous

Question 45

Multiple Choice

Star C and star D are equally luminous.Star C is twice as far away from Earth as star D.How do the brightness level of stars C and D compare?


A) Star C appears four times as bright as star D.
B) Star C appears twice as bright as star D.
C) Star D appears twice as bright as star C.
D) Star D appears four times as bright as star C.

Correct Answer:

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