Energy sharing in beta decay vs. discrete emission in alpha decay Steps: - Alpha decay is a two-body process: the parent nucleus emits an alpha particle to the daughter nucleus, conserving momentum and energy in a fixed ratio, resulting in discrete alpha energy. - Beta decay is a three-body process: the parent nucleus emits a beta particle, an antineutrino, and forms the daughter nucleus; the beta and antineutrino share the available energy variably. - This variable sharing allows beta particles to have any energy from near zero up to a maximum, creating a continuous spectrum. - Alpha particles lack this third particle, so no energy sharing occurs, keeping their energy discrete. Why A is correct: - In beta decay, an antineutrino is emitted along with the beta particle (not with alpha), carrying variable kinetic energy and causing the continuous beta spectrum, per the weak interaction law. Why the others are wrong: - B: Alpha energies (4–9 MeV) are often higher than typical beta maxima (0.1–3 MeV), but energy magnitude doesn't explain discreteness vs. continuity. - C: Betas usually have lower …