本题目来源于试卷: Physics Unit33: Astrophysics and Cosmology，类别为 通用国际物理
[单选题]
A star has absolute luminosity equpg/tsg b s dwg n:l47yv9-d(bu4r3 ,acal to that of the5 kl.ja4z)l by2tr,xdv rf4i: 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:
暂无
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