The Schwarzschild Radius of a Black Hole Is That Radial

Multiple Choice

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.