The ___________ of a black hole is the radius from a black hole at which the escape velocity is approximately equal to the speed of light.

Question

Quizplus · Accepted Answer

The definition provided perfectly fits the concept of an event horizon, which defines the boundary around a black hole beyond which nothing, including light, can escape due to the extremely strong gravitational pull. The other choices are unrelated to this definition: 
A) Roche limit is the minimum distance at which an object held together only by its own gravity starts to disintegrate due to tidal forces.
B) Lagrangian point is a point in space where the gravitational forces balance the centrifugal forces of two large bodies, allowing smaller objects to remain in a stable position relative to the larger bodies.
C) Chandrasekhar limit is the maximum mass of a stable white dwarf star, beyond which it will undergo a supernova explosion or collapse into a neutron star or black hole.
D) Hubble radius is the distance from Earth beyond which objects are receding from us faster than the speed of light due to the expansion of the universe.

The ___________ of a Black Hole Is the Radius from a Black