Engineering Physics Annotation << Back THE APPLICABILITY OF THE DRUDE FORMULA IN ELECTRODYNAMICS OF CONDUCTORS A.V. KUKUSHKIN, A.A. RUKHADZE It is shown that the Drude formula for the permittivity of conducting media satisfi es the Kramers – Kronig relation, unless its real part is negative. This requirement satisfi es the metals and strongly ionized plasma, and do not satisfy the electrolytes (including seawater) and weakly ionized plasma. Key words: Drude formula, Kramers-Kronig relation, surface wave. Contacts: E-mail: avkuku@gmail.com Pp. 09-12.