At what location in the space around a black hole does the escape velocity become equal to the speed of light?
A) At the point where escaping X-rays are produced
B) At the point where clocks are observed to slow down by a factor of 2
C) At the event horizon
D) At the singularity

Question

Quizplus · Accepted Answer

At the event horizon, the gravity of the black hole is so strong that the escape velocity is equal to the speed of light. Anything that crosses the event horizon, including light, is pulled inexorably toward the black hole's singularity and cannot escape.

At What Location in the Space Around a Black Hole