Echo (acoustics)

Whales echolocation organs produce echoes and receive sounds

In acoustics, echo is when sound comes back. The word echo come from Greek word ἠχώ (ēchō) from (ēchos), "sound".

In nature echos happen in empty spaces, woods or mountains.

Echo (acoustics) Media

Seurat L'Echo.jpg
- L'Écho, study for Une Baignade, Asnières (Bathing Place, Asnières). Conté crayon on Michallet paper. 31.2 × 24 cm. New Haven, Yale University Art Gallery (Inventory number 1966.80.11).*Provenance: Unknown date: bequeathed to Yale University Art Gallery,
Toothed whale sound production.svg

Echolocation organs of a toothed whale, which produce echoes and receive sounds. Arrows illustrate the outgoing and incoming path of sound.
Sediment echo-sounder hg.png

This illustration depicts the principle of sediment echo sounding, which uses a narrow beam of high energy and low frequency

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