Exam-style question
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In a nuclear reaction, a small loss of mass results in a large release of energy. Which principle explains this?.
- A.Conservation of momentum.
- B.Conservation of energy.
- C.Mass‑energy equivalence.
- D.Newton's third law.
Model answer
What a good answer should say
- Mass‑energy equivalence.
Explanation
Why this works
Formula: ΔE = Δm c². Substitution: Δm is small, c is large.
Working: Even a tiny Δm yields a large ΔE. Answer: Mass‑energy equivalence.
Units: J.
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