Sonoluminescence

The first known demonstration of sonoluminescence occurred in 1934 as an accidental by-product of a test involving underwater acoustic radar. Early experiments in sonoluminescence produced unpredictable results and the concept was not pursued for many years. In 1988, however, Professor Gaitan successfully produced a single

Other scientists disagree with this explanation of sonoluminescence. Professor Prosperetti believes that sonoluminescence is nothing more than the result of liquid moving within the bubble. Rather than heat creating the light, Prosperetti believes that the speed of the stream of water forced from the bubble by the sound wave causes the bubble to crack, much like a solid. Because the water may move at speeds in excess of 4000 miles per hour, the cracking of the bubble produces sufficient energy to emit light.

The light emitted by sonoluminescence occurs in very short pulses once in each acoustic cycle at the same time as the bubble size decreases immensely. These light pulses are generally less than 100 pico seconds. Although the pulses are short, they occur at regular intervals and at stable frequencies. These properties indicate that sonoluminescen

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