Question

Echo occurs when what happens?

Answer 1

Answer:

This phenomenon is called an echo, which has its origins in the Greek ekho, meaning “sound.” An echo happens when a sound wave reflects off a surface, such as the water at the bottom of a well, and the sound is repeated back to you.

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Answer 2

An echo happens when a sound wave reflects off a surface, such as the water at the bottom of a well, and the sound is repeated back to you.