  In this work we study the wave scattering by small dispersionless particles
with pulsating refractive index. The scattered fields and their resonance
frequencies are calculated by using scalar approximation and exponentially
time-dependent permittivity.
  In addition, the scattering by single sphere with the pulsating permittivity
is calculated numerically for different regimes of the pulsations.
  Our results suggest that the pulsations of the refractive index of the
scatterer significantly affect the scattered field: existing resonances shift,
additional resonances emerge, and deeps in the light scattering spectrum
appear.
