The amplitude, A, is the wave's maximum disturbance from it undisturbed equilibrium position and represents the energy being transferred by the wave. Generally, the energy of a mechanical wave is proportional to the square of the wave's amplitude; i.e., if a wave's amplitude triples, its energy content will become 9-times greater.
On a vibration graph, the period, T, is the time between two adjacent in-phase points on a vibration graph. The reciprocal of period is frequency, f. It represents the numbers of waves that pass a given location each second along the wave's path.
time required for only ONE vibration
total number of vibrations EACH second
sec/vib (or just) seconds (sec)
vib/sec (or just) hertz (hz)
All wave motion is generated by a source that moves or vibrates. Consequently, the frequency of a wave is a property of its source, not of the medium through which its energy subsequently travels.
On a waveform graph, the wavelength,
λ, is the distance between two adjacent in-phase points on a waveform graph.
A crest is a point of maximum positive amplitude along the wave while a
trough is a point of maximum negative amplitude.