Exam-style question
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Which process typically results in a larger mass defect per nucleon?.
- A.fission of a heavy nucleus.
- B.fusion of light nuclei.
- C.both produce similar mass defect per nucleon.
- D.neither produce mass defect.
Model answer
What a good answer should say
- fission of a heavy nucleus.
Explanation
Why this works
Formula: E = Δm c². Substitution: Δm per nucleon = (binding energy per nucleon of product – binding energy per nucleon of original).
Working: For heavy nuclei, Δm per nucleon ≈ 0.8 MeV, larger than ≈0.7 MeV for light nuclei. Answer: energy released.
Units/conclusion: J, energy released. This indicates fission of heavy nuclei produces a larger mass defect per nucleon.
Common mistake
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