本题目来源于试卷: Physics Unit33: Astrophysics and Cosmology,类别为 Generic Physics
[单选题]
A star has absolute luminosity equal to* l1g( /c+q uy+29*+ekesnmt zsapb vc that of fu:ktpsb 85e/*le1w0+e kq 15tav xdothe Sun ($1.5 \times 10^{8} \; km$ from the Earth) but is 10 pc away from the Earth. By what factor will it appear dimmer than the Sun?
A. $2 \times 10^{-9}$
B. $2 \times 10^{-11}$
C. $2 \times 10^{-13}$
D. $2 \times 10^{-15}$
参考答案: C
本题详细解析:
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