Acoustic vibrations are the phenomenon responsible for the production of sounds. Acoustic waves propagate in a medium where the particles vibrate. In this way, acoustic vibrations carry mechanical energy, which is essential for the creation of tones. For sound to be perceived by humans, the frequency of vibrations must exceed the threshold of hearing. It is commonly accepted that this range is between 16 Hz and 20 kHz. Depending on gender, age, and individual predispositions, the range of hearing may vary.
The vibrations of particles in an elastic medium occur around the equilibrium position of these particles. This happens under the influence of the propagation of an acoustic wave, such as a plane wave in air or sinusoidal waves. Sound waves can also propagate in other substances.
The phase of vibration is a quantity that determines the deviation of the wave at a given point and time, relative to its average position. The period of vibration is the smallest time interval necessary to repeat the entire cycle of vibration.
