ENERGY AND NUMBER OF QUANTA OF NONRESONANT WAVES IN NONSTATIONARY CLOSED SYSTEMS

Expressions for the energy density and number of quanta of nonresonant waves in nonstationary media are obtained. The system is supposed to be closed, and the nonstationarity is due to internal processes in it only. The general theorem connecting the characteristic scale of the s low change in time of the dielectric permittivity and the (nonlinear) dissipation rate in such kind of systems is proved. All calculations u se the macroscopic approach based on general principles of the electro dynamics of continious media.