Multiple Choice
Why are black holes called black holes?
A) Nothing,not even electromagnetic radiation,can escape from inside them.
B) Only nonvisible radiation longer than about 1000 nm wavelength (infrared and radio radiation) can escape from them.
C) They are always surrounded by an accretion disk,which absorbs all light escaping from the inside of the black hole.
D) They emit an electromagnetic spectrum,which matches that of a perfect blackbody.
Correct Answer:
Verified
Correct Answer:
Verified
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