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Hogyan történik az ECHO?

A tükrök fog folyni a képeket, és elküldi a fényt vissza. A falak is elküldi a hangokat vissza. Ha állni egy kicsit távolabb a magas fal, vagy egy nagy szikla, akkor hallani a hangját fonó vissza néhány másodperccel később.

Ha egy hanghullám egy falat vagy egy magas és széles kőzetfelületet talál, akkor visszafelé forog a forrás felé. Így történik a visszhang. Ha a kitermelt hang rövid, és a hanghullámok eléri az akkumulátort, mint a szokásos, a visszhang hallható egyértelműen. Nyomai a hang továbbra is a fül 1/10 másodpercig.

Mivel a hang sebessége a levegőben 340 méter/másodperc, a hangforrás és az akkumulátor közötti távolságnak legalább 17 méternek kell lennie.

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