How is echo produced?
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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 rubber ball bounces off the ground. ... That is why echoes can be heard in a canyon, cave, or mountain range.
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Echoes are basically reflections of sound waves. When a wave hits a surface part of the sound is absorbed and the rest bounces back. If you are standing far enough from the surface (about 17 metres away), then you might be able to hear the echo.
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