本题目来源于试卷: Physics Unit33: Astrophysics and Cosmology，类别为 国际高中通用物理
[单选题]
A star has absolute luminosity e : emoowy;;dod2q/8xi qual f6 q+7srj wz)(nfa+lw to that of the 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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