The wavelength of a wave is the length of one complete cycle of a wave. for a transverse wave, the wavelength is determined by measuring from crest to crest. a longitudinal wave does not have crest. in this case, the wavelength can be determined by measuring the distance between any two corresponding points on adjacent waves. in the case of a longitudinal wave, a wavelength measurement is made by measuring the distance from

a) peak to peak.
b) trough to trough.
c) wavelength to wavelength.
d) compression to compression.