What happens to the core of a high-mass star after it runs out of hydrogen? Oa.

Question

What happens to the core of a high-mass star after it runs out of hydrogen? Oa. The core shrinks and cools down b. The core becomes a black hole right away C. Helium fusion in the core begins right away. d. The core shrinks and heats up. QUESTION 12 What types of stars end their lives as main-sequence supernovas? a. All main sequence stars that are yellow in color b. All main sequence stars that are red in color O C. Stars that are at least several times the mass of the Sun. o d. Stars that are similar in mass to the Sun. QUESTION 13 In order to predict whether or not a star will eventually fuse oxygen into a heavier element, you r know what fact about the star? o a. its distance from us O b. its overall abundance of elements heavier than helium. O C. its mass o d. how much oxygen it now has in its core.

Explanation / Answer

question 11

when the the high mass star runnng out of hydrogen, the core of that starts getting contracted and become hotter and smaller, this amkes the upper layer of the star expand. after its contraction it achieve sufficient heat to burn helium into carbon

so option D will be the answer.

Question 12

High-mass stars with >8M Sun have short lives, eventually becoming hot enough to make iron, and end in supernova explosions.

so the option C will be the answer.

Question 13

the production of heavier element from the oxigen fusion is totally dependent on the mass of the star.

so mass plays a important role in production of heavior element .

so option c will be the answer

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