GK
PHYSICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
a surface
|
|
|
a location
|
|
|
matter
|
|
|
None of the above
|
Detailed explanation-1: -A black hole’s “surface, ‘’ called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos.
Detailed explanation-2: -The event horizon is the spherical outer boundary of a black hole loosely considered to be its “surface.” It is the point, according to NASA (opens in new tab), that the gravitational influence of the black hole becomes so great that not even light is fast enough to escape it.
Detailed explanation-3: -The ‘event horizon’ is the boundary defining the region of space around a black hole from which nothing (not even light) can escape. In other words, the escape velocity for an object within the event horizon exceeds the speed of light.
Detailed explanation-4: -The black hole event horizon is teleological in nature, meaning that we need to know the entire future spacetime of the universe to determine the current location of the horizon, which is essentially impossible.