NCEA Level 3 Waves Practice Test

A transverse wave is characterized by the movement of particles in a direction that is perpendicular to the direction of wave propagation. In the case of light waves, they are electromagnetic waves, and they illustrate the properties of a transverse wave clearly. As light travels, its electric and magnetic fields oscillate in directions perpendicular to each other and to the direction of the wave's travel. This behavior distinctly marks light waves as transverse. In contrast, sound waves, pressure waves, and certain seismic waves (specifically primary waves) are examples of longitudinal waves. In these, the particle displacement occurs in the same direction as the wave travels, which is contrary to the behavior of transverse waves. Thus, light waves serve as a clear example of transverse waves due to their unique property of oscillating perpendicular to the direction of energy propagation.