11.1.10—Α-particles have discrete energies but that β-particles have a continuous

Alpha decay between quantised nuclear levels gives particles with characteristic discrete energies; beta decay shares energy with a neutrino, producing a continuous range.

Interpret line spectra and broad beta spectra as evidence about the number of bodies sharing decay energy.

A detector can show sharp alpha peaks but a broad beta distribution ending at a maximum energy.

A continuous beta spectrum does not mean beta particles are emitted with random violation of energy conservation; total energy is conserved event by event.