The Schwarzschild radius 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 published his general relativity theory. It can be calculated from a star's mass M as: R = 2GM/c2. 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.


E

Physics & Space Science

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