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https://physicstoday.scitation.org/do/1 ... 511a/full/Acoustic metamaterials manifest properties unachievable in bulk materials. One such property goes by the colorful name of rainbow-trapping: the ability to absorb sound perfectly and simultaneously over a wide range of frequencies.
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What are metamaterials and how do they work?
A metamaterial is an artificially structured material that is able to exhibit extraordinary electromagnetic properties not seen, or available, in nature.
https://interestingengineering.com/3-ac ... know-about