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en.wikipedia.org/wiki/Echo

In audio signal processing and acoustics, Echo is a reflection of sound that arrives at the ... The reason of reflection may be explained as a discontinuity in the ...

www.gcsescience.com/pwav11.htm

Echo and Reverberation - Reflected Sound Waves.

www.dictionary.com/browse/echo

Echo definition, a repetition of sound produced by the reflection of sound waves from a wall, mountain, or other ... The American HeritageĀ® Science Dictionary

www.tutorvista.com/content/science/science-i/sound/echoes.php

As a result of reflection of sound wave from a large obstacle, the sound is heard which is named as an echo. Ordinarily echo is not heard as the reflected sound ...

www.dkfindout.com/us/science/sound/echoes

An echo is a sound that is repeated because the sound waves are reflected back. Sound waves can bounce off smooth, hard objects in the same way as a ...

www.reference.com/science/echoes-created-fafd0d1c0acfcadf

Echoes work through the reflection of sound waves. When a person shouts into a well or canyon, and they hear an echo, it is because the sound waves reflect from ... science.howstuffworks.com ... What is the definition of resonant frequency?

www.britannica.com/science/echo-physics

A property of waves and sound quite familiar in the phenomenon of echoes is ... science dealing with the behaviour of matter and light on the atomic and ...

science.howstuffworks.com/radar1.htm

Echo - Echoes and Doppler shift are two effects that are key to understanding radar. ... If you shout into a well or a canyon, the echo comes back a moment later . ... The Real Reason Humans Need to Sleep Under BlanketsAtlasobscura.com.

www.cnet.com/news/appliance-science-alexa-how-does-alexa-work-the-science-of-amazons-echo

Aug 4, 2016 ... The Amazon Echo listens to you, translating your voice into commands so it can play music, turn the lights on, or order stuff from Amazon.