A Star Has Absolute Luminosity Equal to That of the Sun

question 3

Multiple Choice

A star has absolute luminosity equal to that of the Sun (1.5 × 10⁸ km from the Earth) but is 10 pc away from the Earth. By what factor will it appear dimmer than the Sun?

• A)2 × 10^-9
• B)2 × 10^-11
• C)2 × 10^-13
• D)2 × 10^-15
• E)2 × 10^-17

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