Chemistry, 04.01.2021 19:20 jivsf

2. What is an echo? It is a compression wave that changes frequency in an unpredictable way.
It indicates the volume, or energy, of the sound.
It is a sound wave that vibrates in one direction towards a different source.
It is a sound wave that has been reflected, or bounced back, toward its source.

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2. What is an echo? It is a compression wave that changes frequency in an unpredictable way.
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