Crest
The farthest point above the resting position
Trough
The farthest point below the resting position
Wavelength
Is the distance between two adjacent crests or two adjacent troughs
Amplitude
The maximum distance above or below the resting position
Frequency
Is the number of cycles in a period of time
Hertz
The frequency of a wave
The colour with the lowest frequency-highest frequency
Red Orange Yellow Green Blue Indigo Violet
(Rainbow)