All about waves

 The transverse wave, transverse  means “moving across”. The particles of the transverse wave vibrate up and down motion. The particles in this kind of wave move perpendicular, or at right angles.

                                                               

        Longitudinal wave. The particles of a medium vibrate back and forth by the path that the wave moves. You can create a longitudinal wave on a spring. When you push on the spring the coils will crowd together. When a part of a longitudinal wave crowd together it is called compression.

Medium, A medium is a substance through which  can travel. A medium can be a solid liquid or gas. The plural of a medium is media.

     rarefaction , a part where the particles spread. Compressions and rarefactions are like crests and troughs of a transverse wave.

Trough, the lowest point of each crest is a trough. Wave, A wave is any disturbance that transmits energy through matter or empty space. Energy is carried by its source by a wave. Compression, A part of a longitudinal wave where the particles are crowded together.