A is a disturbance that carries through a medium. Waves can be classified as transverse, longitudinal, or surface waves. This depends on the of movement of the in the medium compared to the direction of the energy. In waves, the medium particles move to the movement of the energy. In waves, the movement of the particles in the medium is the same direction as the movement of the energy. In waves, only the particles at the surface of the medium move in a motion