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

Question

Quizplus · Accepted Answer

The escape velocity at the event horizon of a black hole becomes equal to the speed of light. This means that not even light can escape from the black hole once it crosses this boundary, hence the term "black hole."

At What Location in the Space Around a Black Hole