Question

question 11 of 20 : select the best answer for the question. 11. how can you determine that a star is about to turn into a red giant? a. when the star falls into the sun b. when a large amount of hydrogen has been turned into helium c. when a large amount of helium has turned into hydrogen d. when the pressure inside the star exceeds its temperature mark for review (will be highlighted on the review page) << previous question next question >>

Explanation:

To determine when a star is about to become a red giant, we analyze the options:

• Option A: Stars don't fall into the sun to become red giants; this is incorrect.
• Option B: A star fuses hydrogen into helium in its core. When most of the hydrogen is converted to helium, the core contracts, and the outer layers expand, leading to the red giant phase. This is correct.
• Option C: Helium doesn't turn back into hydrogen in stellar evolution for this process; this is incorrect.
• Option D: The relationship between pressure and temperature isn't the key factor for a star becoming a red giant; this is incorrect.

Answer:

B. When a large amount of hydrogen has been turned into helium