Asap! points and brainliest define longitudinal wave: a) a wave that vibrates the medium at right angles (perpendicular) to the direction in which the wave energy travels b) the distance between two corresponding parts of a wave. for example, from crest to the very next crest c) wave that vibrates the medium in the same direction in which the wave energy travels d) the distance from the rest position to a crest or a trough; the more energy, the greater the amplitude