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 equ btt/gf o7d5 xd-gyrzf+e.9w7al to xj-fqa 8 qfm pr64r 7bb-nv3qv03 /qbdz9fq+ gthat 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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