In the last section, it was mentioned that the movement of the air molecules through space is the sound wave. A sound wave in which repeats at regular intervals is called a periodic wave. In this section, you will be given an understanding of the parts of a simple perodic wave.
The wave can be graphed with the movement (or amount of pressure exerted by the air molecules) on the vertical axis and the time on the horizontal axis. Such a graph will look like the following:
The amount of air pressure exerted on the air molecules is the amplitude, plotted along the y-axis. The time at which the sound wave travels is on the x-axis. The wavelength of the wave is the distance travelled during one single cycle.