GeneralAnswersv1

Why does an echo return?

A sound wave reflects from a distant surface and arrives later.

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Output
A delayed repetition of the original sound
Input
A short sound made near a large hard surface
Relationship

What connects the input and output?

Part of the pressure wave bounces back. If the travel delay is long enough, the reflected sound is heard separately.

Sources

1
  1. www.noaa.gov: Why does an echo return?www.noaa.gov

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