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Shock absorbers in automobiles are on fo the practical applications of damping motion. A shock absorber consists of a piston moving through a liquid such as oil as in figure

The continuous decrease of amplitude of oscillator is called damped oscillator and the oscillations are called damped oscillations,

Consider the following example. Two cycles of a wave pass a fixed point every second, and the velocity of the wave train is 4 feet per second. What is the wavelength? The formula for determining wavelength is as follows:

If you know the velocity of a wave, you can determine the wavelength by dividing the velocity by the frequency. As an equation:

Definition: Velocity of propagation is the rate at which the disturbance travels through the medium, or the velocity with which the crest of the wave moves along.

The two types of wave motion, Transverse and Longitudinal, have many of the same characteristics, such as frequency, amplitude, and wavelength.