2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93332It is argued that the quantal behaviours may be understood in the framework of direct particle interactions. A specific example is introduced. The assumed potential predicts that at sufficiently large distances quantal behaviours arise, while at very large distances gravitational-like forces are present. The latter is true provided all particles have internal structures.22 pages, LaTex, no figureQuantum Physicstext