5.The escape velocity of matter from the center of a black hole whose mass is gr

Question

5.The escape velocity of matter from the center of a black hole whose mass is greater than 3 solar masses is
Select one:
A. greater than the speed of light.
B. about half the speed of light.
C. always exactly equal to the speed of light.
D. quite small.

6.What is the event horizon of a black hole?
Select one:
A. The infinitesimally small volume at the center of the black hole that contains all of the black hole's mass
B. The “surface” from inside of which nothing can escape
C. The “surface” at which any object passing through it will leave with greater energy than it entered
D. The “surface” at which all events happen

7.What is the radius of the event horizon of a 2-solar-mass black hole?
Select one:
A. 6 km
B. 6 m
C. 60 km
D. 6000 km

Explanation / Answer

5.The escape velocity of matter from the center of a black hole whose mass is greater than 3 solar masses is

D. quite small.

6.What is the event horizon of a black hole?

B. The “surface” from inside of which nothing can escape.

7.What is the radius of the event horizon of a 2-solar-mass black hole?

A. 6 km

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