Sonoluminescence Light Physics Mystery

Sonoluminescence happens when sound waves drive tiny bubbles in a liquid to collapse so violently that they emit brief flashes of light. Scientists have studied the effect since 1934 and can reproduce it in the lab. What they still do not fully agree on is the exact light-producing mechanism inside that collapsing bubble, with competing explanations involving extreme heat, plasma formation, shock waves, or other high-energy effects.

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