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I would like to find a material which could very noticeably reflect or absorb a sound wave frequency between 20Hz and 22kHz, preferably in a grassy or organic nature environment. Preferably this would be a rubbery or plastic material, if not a circuit component. if you know of a circuit component that would also be great.

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  • $\begingroup$ For frequencies in the audible spectrum, the size of the object the material is made of should preferably also be at least in the order of magnitude of the wavelength. That's 15 m for 20 Hz and still 15 mm for 20 kHz (I know that this seems to contraidct the fact that humans with ears < 15 m can hear down to 20 Hz) $\endgroup$ – Hagen von Eitzen Jun 29 '19 at 22:01
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The best reflective return from an acoustic source in air will be generated by something very dense, so as to yield the biggest acoustic impedance mismatch between it and that of air- ideally like a ball of steel. If plastic, use a hard and dense grade, like that used to make bowling balls.

For a circuit component, the best thing would probably be an extra-thick glass/epoxy or fiber/phenolic PC board- the thicker, the better.

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