Here's why:
* Longitudinal waves are characterized by particles vibrating parallel to the direction of wave propagation. This means the particles move back and forth in the same line as the wave travels.
* Transverse waves are the other type of wave, where particles vibrate perpendicular to the direction of wave propagation. Think of a wave on a string, where the string moves up and down while the wave travels horizontally.
Examples of longitudinal waves:
* Sound waves: Sound travels as compressions and rarefactions (areas of high and low pressure) in the medium, causing particles to vibrate back and forth in the direction of the sound wave.
* Seismic P-waves: These waves are the first to arrive during an earthquake, traveling through the Earth's interior as compressions and rarefactions.
