Question

Pasagot po

16.It is where sound travels fastest
17.it is the sound that is reflected or returned
18.it is the unit of measurement used for the loudness and softness sound of sound
19.it is produced through vibrations
20.This is the pitch of the sound or the distance of each wave from one another​

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Answer 1

solid is where the sound is travelled the fastest.

echo is the sound that is reflected or returned.

decibels is the unit of measurement used for the loudness and softness of sound.