By combining math with 3D printing, researchers from Boston University have created a new material that seemingly defies logic: light and air have no trouble passing through it — but sound cannot.
Luft och ljus men inte ljud passerar absorbenten?/interferensmediet? till 94 % ?
Fano-like interference phenomenon absorberar i praktiken vissa frekvenser. Men vilka frekvenser går igenom? Sannolikt de låga.
https://www.sciencealert.com/scientists ... mitstart=1
https://www.fastcompany.com/90316833/sc ... co-workers
https://journals.aps.org/prb/abstract/1 ... .99.024302
https://en.wikipedia.org/wiki/Fano_resonance
JM