Question

What is the difference between a longitudinal wave and a transversewave?
Longitudinal wave: particle displacement is (parallel orperpendicular) to wave velocity.
Transverse wave: particle displacement is (parallel orperpendicular) to wave velocity.

Give an example of a longitudinal wave.
A. light wave
B. sound wave in air

Give an example of a transverse wave.
A. sound wave in air
B. light wave