$12.1 mechanical waves 1. What is mechanical waves? Source of wave-a disturbance(oscillation) Medium-for propagation of waves 2. Classification of mechanical waves According to the direction of particle motion Longitudinal waves: waves whose oscillation or jiggling is along the line the wave propagates. 数的家 $12.1 mechanical waves Transverse waves: the waves whose oscillation or jiggling is perpendicular to the line along which the waves propagates.> Plane of polarization--the plane in which the jiggling f a transverse waves disturbance occurs Pulse wave. Periodic train of waves:2 §12.1 mechanical waves 1. What is mechanical waves? Source of wave—a disturbance(oscillation) Medium—for propagation of waves Longitudinal waves: waves whose oscillation or jiggling is along the line the wave propagates. According to the direction of particle motion 2. Classification of mechanical waves Plane of polarization-- the plane in which the jiggling of a transverse waves disturbance occurs. Pulse wave: Periodic train of waves: §12.1 mechanical waves Transverse waves: the waves whose oscillation or jiggling is perpendicular to the line along which the waves propagates