2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16743We investigate the low-frequency dynamics for transmission or reflection of a wave by a cavity with chaotic scattering. We compute the probability distribution of the phase derivative phi'=d phi/d omega of the scattered wave amplitude, known as the single-mode delay time. In the case of a cavity connected to two single-mode waveguides we find a marked distinction between detection in transmission and in reflection: The distribution P(phi') vanishes for negative phi' in the first case but not in the second case.10 pages including 3 figures; to be published in Physica Scripta (proceedings Nobel Symposium on Quantum Chaos)Disordered Systems and Neural Networkstext