Evanescent acoustic surface wave
= Evanescent acoustic surface wave
A surface wave with phase speed below the bulk sound speed decays normally as $e^{-\alpha z}$, where $\alpha=k\sqrt{1-c^2/c_0^2}$.
= Evanescent acoustic surface wave
A surface wave with phase speed below the bulk sound speed decays normally as $e^{-\alpha z}$, where $\alpha=k\sqrt{1-c^2/c_0^2}$.