Abstract: In this paper are reported results of experimental invertigation of electromagnetic and optical radiations produced by single bubble cavitation. After observation and brief theoretical analysis of growth and collapse of single bubble, these radiations were studied experimentally. The pre-sense of electromagnetic radiation was confirmed. In contrast with the statistical conclusion drawn by other workers for optical radiation, generations of optical and electromagnetic radiations are found to be simultaneous at the moment of bubble collapse. Then the effects of varying liquids and gases and of varying speeds of bubble collapse on electromagnetic and optical radiations were inverstigated. Experimental results show that, although electromagnetic radiation as well as optical radiation occur as predicted by Frenkel, the mechanism cannot be explained by his hypothisis. It is considered that generation of these radiations may be related to the generation of micro-shock wave in the bubble at the moment of its collapse.