The escape velocity at the event horizon around a black hole is
a. smaller than the speed of light.
b. equal to the speed of light.
c. much larger than the speed of light.
d. irrelevant since nothing (including light) can escape from a black hole.
b
You might also like to view...
Global warming
a. has not yet been observed b. has been caused by increasing levels of carbon dioxide in the atmosphere c. has led to a depletion of the ozone layer in the atmosphere d. has no serious consequences
Which of the following protogalactic clouds is most likely to form a spiral galaxy?
A) a very low-density cloud with very little angular momentum B) a dense cloud with very little angular momentum C) a low-density cloud with quite a bit of angular momentum D) a very massive cloud with any density and a lot of angular momentum
According to Kepler results in mid-2013, what fraction of stars host an Earth-size planet?
A) about 20% B) about 100% C) about 15% D) about 70%
The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8.0 ?T. How far is point P from the wire? (?0 = 4? × 10-7 T ? m/
A) A) 2.0 cm B) 2.5 cm C) 4.0 cm D) 5.0 cm E) 10 cm