Which of the Following Best Describes Why a White Dwarf

question 30

Multiple Choice

Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4- solar- mass limit?

• A)White dwarfs are made only from stars that have masses less than the 1.4- solar- mass limit.
• B)Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4- solar- mass limit.
• C)The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists.
• D)White dwarfs get hotter with increasing mass, and above the 1.4- solar- mass limit they would be so hot that even their electrons would melt.

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