How Much in How Long

The wavelength of a wave helps determine a wave's frequency. Frequency, in this case, is defined as the number of cycles (1 cycle = 1 wavelength) of a wave that pass by a certain point in a certain amount of time (generally in cycles per second).

Wavelength

The wavelength of a wave is an extremely important and unique aspect because it helps to determine how that wave is perceived, as we will soon see. Wavelength is measured from crest to crest (or trough to trough) on a wave.