Which of the following describes a star with a hydrogen-fusing shell and an inert (nonfusing) helium core?
A) It is a subgiant that grows in luminosity until helium fusion begins in the central core.
B) It is a red giant that grows in luminosity until it dies in a planetary nebula.
C) It is a subgiant that gradually grows dimmer as its hydrogen-fusing shell expands and cools.
D) It is what is known as a helium core-fusion star, which has both helium fusion in its core and hydrogen fusion in a shell.
A) It is a subgiant that grows in luminosity until helium fusion begins in the central core.
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Indicate whether the statement is true or false
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A. 0 J B. 50 J C. -50 J D. 25 J E. -25 J
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What will be an ideal response?