Question

multiple choice question
a vibration is a _.
o measure of the intensity of a sound wave
o measurement of displacement from the rest position
o type of sound made by a stringed instrument
o back-and-forth motion that repeats itself
need help? review these concept resources.
read about the concept

Explanation:

Vibration is defined as a back - and - forth motion that repeats itself. The measure of the intensity of a sound wave is related to loudness (e.g., decibels). The measurement of displacement from the rest position is amplitude. And a type of sound made by a stringed instrument is just one example of where vibrations occur, not the definition of vibration itself.

Answer:

back - and - forth motion that repeats itself