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An approximate microscopic model is proposed for the explanation of theelectric signal dU = k_B dT/(2e) observed by A.S. Rybalko in He II in theexperiments with standing half-wave of second sound. The model is based on theidea, due to Gutlyanskii, of the one-directional polarization of He-4 atomslocated at the electrode surface. The calculated parameters of the electricsignal are in approximate agreement with the experimental ones. It is alsopredicted that a standing half-wave of first sound should induce a variablesignal with amplitude dU ~ dp/(en) ~ 3*10^{-5} dp*V/atm at the electrode. It isshown also that the dependence of the polarizability of helium on temperature,A(T), can be explained if the tidal polarization of atoms is taken intoaccount. A possibility of the existence of the "dry" friction in He II attemperatures T < 0.5-1 K is discussed.

To the theory of the electric activity of He II induced by waves of first and second sounds