the maximum displacement moved by a point on a vibrating body or wave measured from its equilibrium position

A crest is the point on a wave with the maximum value or upward displacement within a cycle

the lowest point on a wave

the measurement from base to top

the number of crests of a wave that move past a given point in a given unit of time.

the distance over which the wave's shape repeats.

 describes the pulling force exerted by each end of a string

 the velocity at which a wave phase propagates at a certain frequency

Single vibration