Question

what is an event horizon?
the tangible boundary designating the location in which a spacecraft can escape the gravity of a white dwarf.
the magnetically turbulent area surrounding a pulsar.
the mathematical boundary designating the point of no return near a black hole.
a science fiction movie from the 1980s starring lawrence fishbourn and sam neil.
question 2
1 pts
which of the following best describes a black hole in terms of escape speed?
a black holes escape speed is exactly zero.
a black holes escape speed is slightly lower than the speed of light.
a black holes escape speed is slightly higher than the speed of sound.
a black holes escape speed is higher than the speed of light.
question 3
1 pts
is the following statement true or false:
\aside from hawking radiation, black holes do not emit light.\
true
false

Explanation:

Question 1: An event horizon is the boundary around a black hole where the escape speed equals the speed of light, making it the "point of no return."
Question 2: A black hole’s escape speed exceeds the speed of light, so nothing (including light) can escape it.
Question 3: Black holes trap light due to their strong gravity; Hawking radiation is the only known emission, so the statement is true.

Answer:

Question 1: The mathematical boundary designating the "point of no return" near a black hole.
Question 2: A black hole's escape speed is higher than the speed of light.
Question 3: True