2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35185We investigate the scattering of phase oscillation of Bose-Einstein Condensate by a 'draining of bathtub' type fluid motion. We derive a relation between the reflection and transmission coefficients which exhibits existence of analog of 'Superradiance effect' in BEC vortex with sink.12 pages, No figureGeneral Relativity and Quantum Cosmologytext