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avaldis: Δf=[2vf(0)/c(0)]cosϴ, kus Δf on Doppler nihkesagedus, f(0) on heli esialgne sagedus, c(0) on heli kiirus veres, v on vere voolukiirus ja ϴ on nurk lainefrondi levikusuuna ja vere voolu suuna