One complete oscillation in terms of sound wave frequency is the change in density from the maximum value to the minimum value, and then back to the maximum value again.

Frequency can be likened to the number of times a drum is beaten in a given time period. If you beat a drum ten times in one minute, the frequency of your drumming is ten beats per minute.

Frequency in the context of sound waves refers to the number of compressions or rarefactions that pass a point in the medium per unit time.

The SI unit of wavelength is meter (m), and it is commonly represented by the Greek letter λ (lambda).

The distance between two consecutive compressions or rarefactions is called the wavelength.