Awave travels through a medium and displaces the particles perpendicular to the direction in which the wave is traveling. this type of wave is a select one: a. transverse wave because of the direction that the particles are being displaced as the wave travels. b. longitudinal wave because of the way the particles are displaced as the wave passes through. c. longitudinal wave because it moves forward through a medium causing the particles to vibrate. d. transverse wave because it is not traveling in a vacuum and the particles are moving.