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Scientist with sonoluminescence equipment

Scientist with sonoluminescence equipment

T875/0673

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Credit

PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY

Caption

Sonoluminescence research. Scientist with equipment for researching sonoluminescence, the production of light from bubbles in water when exposed to high-frequency sound (ultrasound). The researcher is injecting tiny bubbles into a bulb filled with water that has no gas dissolved in it. The bubbles are trapped at the centre of the bulb by ultrasound that makes them expand and contract. As the bubbles collapse on themselves at speeds of more than 4 times the speed of sound in air, a shock wave is created within them which concentrates enough energy to create a pulse of light that lasts for 50 microseconds. Photographed at the Meurice Institute in Brussels, Belgium.

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