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.
Reflection
I am guessing a sound wave.
An echo.
Echo..... Yes most certainly an echo.
Echo
A standing wave?
An Echo-echo-echo-echo! The answer is Echo
An echo is a sound wave that has bounced off a surface
The result of a reflected sound wave is obviously an echo.
Reflection
I am guessing a sound wave.
A wave reflection.
An echo.
Echo..... Yes most certainly an echo.
A bounced sound wave is acalled an echo. You can hear these echos when you yell into a cave or a crevasse or an abyss.
Echo
Reflection