Question

which best describes vibration?
○ the distance traveled per unit in time
○ the action of moving back and forth quickly and steadily
○ the distance between one compression and the compression next to it
○ the action of moving through a material or substance

Explanation:

• Analyze each option:
• "the distance traveled per unit in time" describes speed, not vibration.
• "the action of moving back and forth quickly and steadily" matches the definition of vibration (oscillatory motion).
• "the distance between one compression and the compression next to it" is wavelength, related to waves but not vibration's definition.
• "the action of moving through a material or substance" describes propagation, not vibration.

Answer:

the action of moving back and forth quickly and steadily