Question

what is the main difference between nuclear fission and nuclear fusion?

• fusion is the combining of two nuclei to form one, while fission is the splitting of one nucleus to form two.
• fission gives off energy while fusion absorbs energy.
• fission is the combining of two nuclei to form one, while fusion is the splitting of one nucleus to form two.

Explanation:

To determine the main difference between nuclear fission and nuclear fusion:

1. Recall the definitions: Nuclear fusion is the process of combining two (or more) atomic nuclei to form a single, heavier nucleus. Nuclear fission is the process of splitting a heavy atomic nucleus into two (or more) lighter nuclei.
2. Analyze the options:

• The first option: "Fusion is the combining of two nuclei to form one, while fission is the splitting of one nucleus to form two." matches the definitions of fusion (combining nuclei) and fission (splitting a nucleus).
• The second option is incorrect because both fusion (e.g., in stars) and fission (e.g., in nuclear reactors) release energy under appropriate conditions.
• The third option swaps the definitions of fission and fusion, which is incorrect.

Answer:

A. Fusion is the combining of two nuclei to form one, while fission is the splitting of one nucleus to form two.