Question

exam lesson name: chemistry
exam number: 700700rr
▶ exam guidelines
▶ exam instructions

question 7 of 20 :
select the best answer for the question.

1. the source of the suns heat is nuclear

○ a. fusion.
○ b. disintegration.
○ c. separation.
○ d. fission.

□ mark for review (will be highlighted on the review page)

<< previous question next question >>

Explanation:

To determine the source of the sun's heat, we analyze the options:

• Option A: Nuclear fusion is the process where light atomic nuclei (like hydrogen) combine to form heavier ones (like helium) in the sun's core, releasing a huge amount of energy (heat and light).
• Option B: Disintegration generally refers to breaking apart, not the sun's energy source.
• Option C: Separation is about dividing substances, not relevant to the sun's energy production.
• Option D: Nuclear fission is the splitting of heavy nuclei (e.g., uranium), which is not how the sun produces energy.

So the correct answer is based on the knowledge that the sun's heat comes from nuclear fusion.

Answer:

A. fusion.