The rapid back and forth of air or other matter is the sounds vibration (vibration is the anwser).
That would be sound.
is virating.
Vibration
trill
vibration or brownian motion
The time required for a single vibration (back and forth motion).
it is a vibration :)
Vibrations
It may be circular, but it may just as well just go back and forth. I believe just going back and forth is more common.
Vibration
vibration or brownian motion
Vibration
longitudinal vibration
A vibration.
The time required for a single vibration (back and forth motion).
vibration
it is a vibration :)
vibration
vibration
Linear back and forth motion at any speed is technically termed "Reciprocating Motion".
Vibration is the rapid back-and-forth motion of the strings and frame that follows the shock of the initial impact of the ball. Although some players find it annoying and use a vibration damper to reduce it, vibration has little effect on your hand or arm.