An acoustic black hole
An elegant experiment showing that acoustic waves are amplified after scattering by a rotating body demonstrates an effect predicted in 1971 by Yakov Zel’dovich. This result has implications for the understanding of scattering from black holes. Fig. 1: A simple setup to measure Zel’dovich amplification. References1.Zel’dovich, Y. P. JETP Lett.…
bubmagJune 22, 2020