A type II supernova

a. occurs when a white dwarf's mass exceeds the Chandrasekhar limit.
b. is the result of helium flash.
c. is characterized by a spectrum that shows hydrogen lines.
d. occurs when the iron core of a massive star collapses.
e. is characterized by a spectrum that shows hydrogen lines and occurs when the iron core of a massive star collapses.


e

Physics & Space Science

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