Question

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a sound that has been reflected and can be distinguished from the original sound is called a(n)
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Explanation:

When sound reflects off a surface and is distinguishable from the original sound, it meets the definition of an echo. Echoes occur when the reflected sound wave has a sufficient time delay (usually at least 0.1 seconds in air at normal conditions) so that the human ear can perceive it as a separate sound.

Answer:

echo