When hydrogen fuel, in the core of a main-sequence star, is sufficiently deplete
ID: 1793830 • Letter: W
Question
When hydrogen fuel, in the core of a main-sequence star, is sufficiently depleted, ____
the core expands & heats up.
the core contracts & heats up.
the core contracts & cools down.
the core neither expands or contracts, but heats up as helium fuses into carbon.
the core expands & cools down.
a.the core expands & heats up.
b.the core contracts & heats up.
c.the core contracts & cools down.
d.the core neither expands or contracts, but heats up as helium fuses into carbon.
e.the core expands & cools down.
Explanation / Answer
When hydrogen fuel in the core of star is sufficiently depleted it's nuclear reaction slows down and core begins to contract due to its own gravity.This makes a hydrogen zone in shell arond its core causes fusion in the shell around core which results into expansion of this outermost shell.As a result,the energy produced in burning of shell of star is spread over a much larger surface area resulting into a lower surface temperature.
Hence,option C e.g. the core contracts & cools down is the correct answer.
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