Here's why:
* Longitudinal waves have vibrations that are parallel to the direction the wave travels.
* Transverse waves, on the other hand, have vibrations that are perpendicular to the direction the wave travels.
Think of a slinky:
* Longitudinal wave: If you push and pull the slinky back and forth, the coils move back and forth along the direction of the wave.
* Transverse wave: If you shake the slinky up and down, the coils move perpendicular to the direction of the wave.
Examples of longitudinal waves:
* Sound waves: Sound travels through air, water, or solids as a series of compressions and rarefactions (areas of higher and lower pressure), which move in the same direction as the sound wave.
* Seismic P-waves: These are the primary waves that travel through the Earth during an earthquake. They compress and expand the ground in the same direction they move.
