A single 215Rn nucleus, initially at rest, emits an alpha particle as it decays into a 211Po nucleus. There are no other decay products, and the kinetic energy of the alpha particle is measured to be 1.390 × 10-12 J. What is the total amount of nuclear potential energy, in joules, that was released in this process?
What is the difference between the original mass of the 215Rn nucleus and the total mass of the fragments (211Po and alpha particle) after the decay?