An effect has been discovered that irradiation of a silicon sample by light changes the properties of another silicon sample several centimeters away from the former. This effect is observed if the samples are in contact with a fluoroplastic-NaCl aqueous solution system or a sodium-containing glass-water system. Results have been treated based on the earlier model of hypersonic wave generation by light in a siliconnative oxide system and the hypothesis for hypersonic wave propagation along a solid-aqueous medium interface due to the presence of Na + -[H 2 O] n clusters.