The silver nano particles have been prepared by the reducing compound and the sonochemical irradiation of an aqueous solution of silver nitrate and polyvinylpyrrolidone. The silver nano particles were characterized using technique such as transmission electron microscopy, X-ray diffraction absorption spectroscopy, particle size analyzer by the dynamic light scattering. By the ultrasonic irradiation the absorbed spectra were shifted to lower wavelength, the distributions of the particles were sharper than the case without the ultrasonic irradiation.
