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Miten ECHO tapahtuu?

Peilit virtaa kuvia ja lähettää valoa takaisin. Seinät myös lähettää ääniä takaisin. Jos seisoo hieman kauempana korkea muuri tai iso kallio, kuulet äänesi pyörivät takaisin muutamaa sekuntia myöhemmin.

Jos ääni aalto kohtaa seinän tai suuren ja leveän kiven pinnan, se pyörii taaksepäin kohti sen lähdettä. Näin kaiku tapahtuu. Jos uutettu ääni on lyhyt ja ääni aallot saavuttavat akun normaalisti, Kaiku kuullaan selvästi. Jälkiä Sound pysyvät korvassa 1/10 sekuntia.

Koska nopeus ääni ilmassa on 340 metriä sekunnissa, etäisyys ääni lähteen ja akun olla kaiku on oltava vähintään 17 metriä.

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