The amplitude on a longitudinal wave is a measure of? A. the speed of the wave. B. how high off the resting position the wave is. C. how compressed or rarefied the medium becomes.
. Amplitude is a measure of the amount of energy in a wave. In a transverse wave, amplitude is the measure from the resting position to either the crest (high point of the wave) or to the trough (low point of the wave.)