O-LevelPhysicsNuclear Physics5054/11 · Oct/Nov 2010 · Q141 Mark
When one radium nucleus decays, its mass decreases by 8.8 × 10⁻³⁰ kg. How much energy is equivalent to this loss in mass? (speed of light c = 3.0 × 10⁸ m/s)
A6.8 × 10⁻⁴² J
B2.6 × 10⁻²¹ J
C4.0 × 10⁻¹³ J
D7.9 × 10⁻¹³ J
✓ Correct answer
D: 7.9 × 10⁻¹³ J
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