Stimulated low-frequency Raman scattering in aqueous suspensions of different nanoparticles, appearing as a result of laser pulses interaction with nanoparticles acoustic vibrations, is realized. Frequency shifts of the scattered light components are defined by eigenfrequencies of nanoparticles, situated in gigahertz and near terahertz range. In zinc sulfide suspension directed X-ray emission has been observed under nanosecond laser pulses excitation.