2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/187999Ehlers and Kundt have provided an approximate procedure to demonstrate that gravitational waves impart momentum to test particles. This was extended to cylindrical gravitational waves by Weber and Wheeler. Here a general, exact, formula for the momentum imparted to test particles in arbitrary spacetimes is presented.6 pagesGeneral Relativity and Quantum Cosmologytext