Respuesta :
Answer: Sound is vibrations you can hear, sound travels the air as longitudinal waves. Sound must travel through a medium.
Explanation:
Hope this helps, in physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.
Answer:
1) vibration
2) longitudinal
3) medium
Sound is the vibration you can hear, sound travels the air as longitudinal waves. Sound must travel through a medium.