Exam-style question
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If a particle interaction conserves charge, energy, and momentum, and the initial energy is 10 J, what is the final energy?.
- A.5 J
- B.10 J
- C.15 J
- D.20 J
Model answer
What a good answer should say
- 10 J
Explanation
Why this works
In a closed system where charge, energy, and momentum are conserved, the total energy before the interaction must equal the total energy after the interaction. Thus, if the initial energy is 10 J, the final energy must also be 10 J.
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