If there were mixing processes in a main-sequence star with a radiative zone (there aren't) that churned up all the material in the interior, we would expect that the main-sequence lifetime would be ________ because ________.
A) shorter; the star would turn into a giant faster
B) shorter; the star would burn hydrogen faster and have a higher luminosity
C) longer; helium nuclei have a higher mass than hydrogen nuclei
D) shorter; the star would never turn into a red giant
E) longer; more hydrogen would be available to burn

Question

Quizplus · Accepted Answer

Mixing processes would bring fresh hydrogen into the core, allowing the star to sustain nuclear fusion for a longer period, thus extending its main-sequence lifetime.

If There Were Mixing Processes in a Main-Sequence Star with a Radiative