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Types of the waves
There are two types of waves.
Transverse waves
Those waves in which particles of the medium vibrate at the right angle to the direction of motion of the wave are called transverse waves.
For example: Water waves, light, radio and all other electromagnetic waves.
Transverse waves can be produced with the help of spring as shown below.
Longitudinal waves
Those waves in which particles of the medium vibrate along the direction of motion of the wave are called longitudinal waves.
For example: Sound waves.
Longitudinal waves in terms of wave-fronts can be shown as:
Longitudinal wave consists of compression and rarefaction