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Anechoic tile
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<p>Anechoic tiles are <a href="/facts/Rubber/CbsjJxhY">rubber</a> or synthetic polymer tiles containing thousands of tiny voids, applied to the outer hulls of military ships and <a href="/facts/Submarine/6fhcAKHV">submarines</a>, as well as <a href="/facts/Anechoic_chamber/J6XjAMKx">anechoic chambers</a>. Their function is twofold: </p> <ul><li>To absorb the sound waves of <a href="/facts/Sonar/0Rg2G40e">active sonar</a>, reducing and distorting the return signal, thereby reducing its effective range.</li> <li>To <a href="/facts/Attenuate/XP4vX360">attenuate</a> the sounds emitted from the vessel, typically its engines, to reduce the range at which it can be detected by <a href="/facts/Sonar/0Rg2G40e">passive sonar</a>.</li></ul>