Echo

Summary: When sound reflects off a surface it produces an echo. Sound takes time to travel. There is a time delay (short wait) between making a sound and hearing an echo. Soft surfaces like curtains, or specially designed surfaces like those in. Tags: science student-book-7 physics Created: 2026-05-21 Last Updated: 2026-05-21

Echo

When sound reflects off a surface it produces an echo. Sound takes time to travel. There is a time delay (short wait) between making a sound and hearing an echo. Soft surfaces like curtains, or specially designed surfaces like those in.

Source

This concept is from the [Science Student Book 7](Science Student Book 7/Physics/Sound/2.5 Echoes and ultrasound.md), Physics section.