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Based on interrelation between the thermodynamic and electromechanicalphenomena in superfluid helium, the explanation of experimentally foundfeatures of microwave interaction in the frequency range of 40-200 GHz isgiven. Due to fast roton-roton and roton-phonon interactions resonantexcitation on frequency correspond to minimal roton energy relaxes and forms awide pedestal. Alongside these fast processes, there are also slower processesof rotons' scattering by microwave photons taking place, which lead toadditional absorption of energy of resonant microwaves and to the appearance ofa narrow resonant peak on the background of a wide pedestal. The theoreticalexplanation of the influence which streams exert on resonant absorption ofmicrowaves is given. The critical velocity of stream at which absorption ofmicrowaves was replaced by their radiation is found.

Features of interaction of microwaves with HeII