A Star Has Absolute Luminosity Equal to That of the Sun

question 12

Multiple Choice

A star has absolute luminosity equal to that of the sun but is 10 pc away from the Earth. By what factor will it appear dimmer than the sun? The earth is $1.5 \times 10 ^ { 8 } \mathrm {~km}$ from the sun, and 1 parsec is equal to $3.09 \times 10 ^ { 16 } \mathrm {~m}$ .

• A) \(2 \times 10 ^ { - 9 }\)
• B) \(2 \times 10 ^ { - 11 }\)
• C) \(2 \times 10 ^ { - 15 }\)
• D) \(2 \times 10 ^ { - 13 }\)

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