Question

The starting materials in a nuclear change have a total mass of 2.3465 × 10–27 kg. After the change, the resulting materials have a mass of 2.3148 × 10–27 kg.

How much energy was released during the change?

2.85 × 10–12 J
2.08 × 10–10 J
2.11 × 10–10 J
8.56 × 10–4 J

Answer 1

Delta m = 2.3465×10⁻²⁷ − 2.3148×10⁻²⁷ = 3.17×10⁻²⁹ kg.
E = Δm c² = 3.17×10⁻²⁹ × (3.00×10⁸)² = 3.17×10⁻²⁹ × 9.00×10¹⁶ = 2.85×10⁻¹² J.

Answer: 2.85 × 10⁻¹² J.