2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/91217We discuss some of the properties of the `collision' of a quantum mechanical wave packet with an infinitely high potential barrier, focusing on novel aspects such as the detailed time-dependence of the momentum-space probability density and the time variation of the uncertainty principle product $Δx_t \cdot Δp_t$. We make explicit use of Gaussian-like wave packets in the analysis, but also comment on other general forms.13 pages, 5 separate .ps figuresQuantum Physicstext