Transverse Wave is Question 1 options: one which the medium is displaced perpendicular to the wave to direction of wave propagation, such as waves on a string. one which the medium is displaced parallel to the wave to direction of wave propagation, such as waves on a string. one which the medium is displaced perpendicular to the wave to direction of wave propagation, such as sound wave in air. one which the medium is displaced perpendicular to the wave to direction of wave propagation, such as sound wave in air