# Types of Waves

Waves can be classified into 2 groups
transverse wave
longitudinal wave

### Transverse Wave

A transverse wave is a wave where the particles of the medium vibrate in a direction that is perpendicular to the direction of the wave motion.

Example:
Light wave, ripple, radio wave

### Longitudinal Wave

A longitudinal wave is a wave where the particles of the medium vibrate in a direction that is parallel to the direction of the wave motion.

Example:
Sound Wave

### Transverse Wave – Crest and Trough

1. When discussing wave, it’s important to know what is meant by the crest and trough of a wave.
2. The point at which the displacement of the water from its normal level is highest called the crest of the wave
3. The point at which the displacement of the water from its normal level is lowest called the trough of the wave.

### Longitudinal Wave – Compression and Rarefaction

1. Unlike transverse wave, longitudinal waves have no crest and trough, instead, they have compression and rarefaction.
2. In compression regions of longitudinal waves, wave particles of the medium are packed closer.
3. In rarefaction regions, wave particles of the medium are packed further apart.