Final answer:
In a transverse wave, the particles of the medium oscillate perpendicular to the direction of wave propagation.
Step-by-step explanation:
In a transverse wave, the particles of the medium oscillate perpendicular to the direction of wave propagation. This means that the particles move up and down or side to side, while the wave itself moves forward. For example, in a water wave, the water particles move up and down as the wave moves horizontally.