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DWhen 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)
A 6.8 × 10–42 J B 2.6 × 10–21 J C 4.0 × 10–13 J D 7.9 × 10–13 J