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]
The Schwarzschild radiua9bw5*sce-wa l -l3:a o.lif- -hkxh j69y ip f0 zrt+xsjkc)+s of a black hole is that radial distance from the center of a sphere within which not even light can escape. It was first discovered mathematically by Schwarzschild in 1916 after Einstein publ9jk+yp sf)czr ti 0x+6ished his general relativity theory. It can be calculated from a star's mass M as: $R = 2GM/c^2$. Take the radius of both stars A and B as the Schwarzschild radius. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to star B will be
A. the same.
B. twice as much.
C. half as much.
D. four times as much.
E. one-fourth as much.
参考答案: E
本题详细解析:
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