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coefficient a is defined as the ratio of the intensity of the reflected wave relative to the incident (transmitted) wave, tegur, mis on määratletud kui peegeldunud laine intensiivsuse suhe edastatud laine intensiivsuse suhtes
helipeegeldustegur . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/helipeegeldustegur/1/est (04.07.2026)