Question detail
Which statement is the best definition of nuclear fission?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Nuclear fission and fusion
Question
- A. A large unstable nucleus splits into smaller nuclei
- B. Two light nuclei join to form a heavier nucleus
- C. Electrons are transferred between atoms
- D. A radioactive source makes an object contaminated
Answer
A large unstable nucleus splits into smaller nuclei. This is the definition of nuclear fission and separates it from fusion, chemical change, and contamination.
Explanation
A large unstable nucleus splits into smaller nuclei is correct. Nuclear fission is a nuclear process in which a heavy unstable nucleus splits, releasing energy and often more neutrons. Two light nuclei joining is nuclear fusion, electrons transferring is a chemical/electrical process rather than fission, and contamination means radioactive atoms are present on or inside an object. This question tests the definition of fission, so the answer must include a large unstable nucleus splitting.
Common mistake
Misunderstanding Nuclear Fission
Students often confuse nuclear fission with nuclear fusion, thinking both involve the splitting of nuclei.
Remember that nuclear fission specifically refers to the splitting of a large unstable nucleus, while nuclear fusion involves the joining of two light nuclei.
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