GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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slower than the speed of light
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unknown
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faster than the speed of light
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None of the above
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Detailed explanation-1: -The escape velocity from the surface (i.e., the event horizon) of a Black Hole is exactly c, the speed of light. Actually the very prediction of the existence of black holes was based on the idea that there could be objects with escape velocity equal to c.
Detailed explanation-2: -Any object that is smaller than its Schwarzschild radius is a black hole – in other words, anything with an escape velocity greater than the speed of light is a black hole.
Detailed explanation-3: -At a certain distance from the singularity, the escape velocity drops to the speed of light (about 186, 000 miles/300, 000 km per second). This distance is known as the Schwarzschild radius, in honor of Karl Schwarzschild, who first defined it.
Detailed explanation-4: -But once this surface is crossed, nothing can escape, regardless of its speed, because of the strong gravitational pull toward the center of the black hole. Not even light can escape-and light is the fastest thing in the universe!