The wave in which the particles of the medium move at right angles to the direction the wave travels is called a transverse wave.

Here's a breakdown:

* Transverse wave: The particles in the medium oscillate perpendicular to the direction of wave propagation. Imagine shaking a rope up and down – the wave moves horizontally, while the rope itself moves vertically.

* Longitudinal wave: The particles in the medium oscillate parallel to the direction of wave propagation. Think of a slinky: when you push and pull on one end, the compressions and rarefactions travel along the slinky in the same direction.

Some examples of transverse waves include:

* Light waves

* Electromagnetic waves

* Waves on a string

* Seismic S-waves (secondary waves)

Let me know if you have any other questions!