The escape velocity at the event horizon of a black hole is 3×108 m/s – McqOptions

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1.	The escape velocity at the event horizon of a black hole is 3×108 m/s, i.e., the velocity of light. What is the mass of the black hole if the distance from its centre to the event horizon is 18km?
A.	12.15 x 10-30 kg
B.	12.15 x 1030 kg
C.	Infinity
D.	Cannot be determined
Answer» C.

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