A Black Hole Is So Named Because

question 123

Multiple Choice

A black hole is so named because

• A) no light or other electromagnetic radiation can escape from inside it.
• B) its electromagnetic radiation is gravitationally redshifted to the infrared, leaving no light in the optical region.
• C) it emits a perfect blackbody spectrum.
• D) it is colder than the rest of the universe; that is, its effective temperature is less than 3 K.

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