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Hydrodynamics

The single biggest key to sound reduction, the team found, was the synchronization of the school’s tail flapping—or actually the lack thereof. If fish moved in unison, flapping their tail fins at the same time, the sound added up and there was no reduction in total sound. But if they alternated tail flaps, the fish canceled out each other’s sound, the researchers found.

What’s quieter than a fish? A school of them

Categories Life & Non-humans, Physics & Mathematics

This graphic shows the energy density (yellow is high; purple is low) at different times during the hydrodynamic evolution of matter created in a collision of a lead ion (moving to the left) with a photon emitted from another lead ion (moving to the right

Hitting nuclei with light may create fluid primordial matter

Categories Physics & Mathematics

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