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 d.uuxzsz fwu9); x1u)luminlct5w q y/r-7cpmi* w)osity equal 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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Post time 2024-1-22 00:41:59