Stars: a Star Has Absolute Luminosity Equal to That of the Sun

question 32

Multiple Choice

Stars: A star has absolute luminosity equal to that of the sun, which is 1.5 × 10⁸ km from the earth, but this star is 32.6 light-years away from the earth. By what factor will it appear dimmer than the sun? (1 ly = 9.461 × 10¹⁵ m)

• A) 2.4 × 10^-9
• B) 2.4 × 10^-11
• C) 2.4 × 10^-13
• D) 2.4 × 10^-15
• E) 2.4 × 10^-17

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