Sonic doom: Making a sound barrier: Sonic crystals are really not much more than arrangements of objects that scatter sound waves, but they have one very alluring feature: with careful design they can stop sound dead...
The key to this effect lies in the spacing between pipes. If incoming sound waves have a wavelength roughly equal to the distance between any two pipes, the sounds are reflected and interfere destructively...
Physicist Juan Sánchez-Pérez at UPV is aiming for a similar effect by using pipes of different diameters arranged in a pattern based on a fractal arrangement called a Sierpinski triangle...
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