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JAMB Physics 1998 Question 49

Question 49

Radioactivity and Nuclear Physics

In a nuclear fusion experiment, the loss of mass amounts to 1.0 × 10−6 kg. The amount of energy obtained from the fusion is [Speed of light = 3.0 × 108 m s−1]

  1. A.3.0 × 10−4 J
  2. B.3.0 × 10−1 J
  3. C.9.0 × 104 J
  4. D.9.0 × 1010 J
Show the answer and explanation

Answer: D (9.0 × 1010 J)

Explanation

E = mc2 = 1.0 × 10−6 × (3.0 × 108)2 = 9.0 × 1010 J.