An echo of a wave is exactly the same type of wave as the original wave. An echo is simply the original wave returning to the observer, so if you made a sound (a longitudinal wave of vibrating air molecules), the echo is also sound waves.
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An echo is a sound wave that is reflected off a surface and heard again. It is a type of longitudinal wave, which means that the particles vibrate parallel to the direction of the wave's propagation.
It is called an echo.
The echo of a sound wave is due to the reflection of the sound wave off a hard surface, such as a wall or a cliff. The reflected sound wave travels back towards the source, creating the perception of an echo.
When a sound wave is reflected, it produces an echo. The echo is the reflected sound wave that is heard after bouncing off a surface back towards the source.
The reflection of a sound wave is called an echo. When a sound wave encounters a hard surface, it bounces back and can be heard again, creating an audible reflection known as an echo.
The reflected sound wave is called an echo.