WJEC A Level Physics
WJEC A Level Physics 3.6 Nuclear Energy Exam Questions
Free WJEC A Level Physics exam questions on 3.6 Nuclear Energy, with mark schemes. Covers mass-energy equivalence, binding energy, fission and fusion.
3.6 Nuclear Energy exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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A Level Physics Flashcards
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Pick your exam board, then test yourself with the questions on this page.
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About WJEC A Level Physics 3.6 Nuclear Energy
This topic covers energy released from nuclei.
What you need to know
- Mass defect Difference between nucleon masses and nucleus mass.
- E = mc² Converting mass defect to energy, including u to MeV.
- Binding energy per nucleon Curve peaks near iron-56.
- Fission and fusion Both release energy by increasing binding energy per nucleon.
Common mistakes in 3.6 Nuclear Energy
- Saying binding energy is stored in the nucleus.
- Forgetting fusion needs high temperatures.
- Confusing total and per-nucleon binding energy.
Try three 3.6 Nuclear Energy exam-style questions
1. Convert a mass defect of 0.030 u to MeV. (1 mark)
Show the mark scheme answer
0.030 x 931 = 27.9 MeV.
2. Explain why fusion of light nuclei releases energy. (2 marks)
Show the mark scheme answer
The products have higher binding energy per nucleon (1), so mass decreases and energy is released (1).
3. State why fusion needs high temperatures. (1 mark)
Show the mark scheme answer
Nuclei need enough kinetic energy to overcome electrostatic repulsion.
3.6 Nuclear Energy FAQs
What does Nuclear Energy cover?
Mass defect, binding energy, fission and fusion.
What is 1 u in MeV?
About 931 MeV.
Why is iron the most stable nucleus?
It has close to the highest binding energy per nucleon.
Revise this topic with flashcards: A Level Physics Flashcards, with mark scheme answers for Anki and Quizlet.
