Which statement about black holes is true?Group of answer choicesThey form from 1.4 solar mass stars.Their escape velocity is greater than the speed of light.Their event horizon is a physical surface boundary.Their main sequence mass was 1-3 solar masses.
Question
Which statement about black holes is true?Group of answer choicesThey form from 1.4 solar mass stars.Their escape velocity is greater than the speed of light.Their event horizon is a physical surface boundary.Their main sequence mass was 1-3 solar masses.
Solution
The true statement about black holes is: "Their escape velocity is greater than the speed of light."
Here's why:
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They form from 1.4 solar mass stars: This is not entirely true. Black holes are formed from stars that are much larger, typically 20 solar masses or more. The 1.4 solar mass limit (also known as the Chandrasekhar limit) is the maximum mass a white dwarf star can have before it explodes in a Type Ia supernova or collapses into a neutron star.
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Their escape velocity is greater than the speed of light: This is true. The escape velocity of a black hole is the speed that would have to be achieved to escape its gravitational pull. For a black hole, this speed is greater than the speed of light, which is why nothing, not even light, can escape a black hole once it passes the event horizon.
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