The term "Schwarzschild radius" refers to
A) the distance to which gas is ejected in a planetary nebula.
B) half the diameter of a neutron star.
C) half the diameter of the singularity in a black hole.
D) the distance from the center of a black hole at which the escape velocity becomes equal to the speed of light.

Question

Quizplus · Accepted Answer

The Schwarzschild radius is the distance from the center of a black hole at which the escape velocity becomes equal to the speed of light. It is the point of no return, beyond which nothing can escape the gravitational pull of the black hole.

The Term "Schwarzschild Radius" Refers to