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Comment ECHO se produit-il?

Les miroirs écoulent les images et renvoient la lumière. Les murs envoient aussi les voix en arrière. Si vous vous tenez un peu plus loin d'un haut mur ou d'une grande falaise, vous entendrez votre voix tourner en arrière quelques secondes plus tard.

Si une onde sonore rencontre un mur ou une surface rocheuse élevée et large, elle tourne vers l'arrière vers sa source. C'est ainsi que l'écho se produit. Si le son extrait est court et les ondes sonores atteignent la batterie comme d'habitude, l'écho est entendu clairement. Les traces du son restent dans l'oreille pendant 1/10 secondes.

Parce que la vitesse du son dans l'air est 340 mètres par seconde, la distance entre la source audio et la batterie pour être un écho doit être d'au moins 17 mètres.

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