Chapter 13 wave motion and sound Classification According to Oscillation Types(P327) 1. Transverse waves横波 The direction of oscillation of medium elements is perpendicular to the direction of travel of the wave。 Compressions and expansions correspond to the crests(波峰) and troughs(波谷) of a transverse waves。 ◆横波:质点振动方向与波的传播方向相垂直的波 (仅在固体中传播)Chapter 13 Wave Motion and Sound Classification According to Oscillation Types(P327) 1. Transverse Waves 横波 The direction of oscillation of medium elements is perpendicular to the direction of travel of the wave. Compressions and expansions correspond to the crests (波峰) and troughs (波谷) of a transverse waves. ❖横波：质点振动方向与波的传播方向相垂直的波. （仅在固体中传播 ）