It is a rarefaction.
divergent
longitudinal wave
=They are ferry boats that carried cars and people back and forth.=
The Antonine Wall is between Firth of Forth and Firth of Clyde.
"Hereto" means to this document or to this writing. For example a Will may state that certain personal property is to be distributed according to the list hereto attached. Or, a Petition may ask the court's review of the matter set forth in an Affidavit hereto attached.
Particles in matter move back and forth at right angles to the direction of the wave due to the transverse nature of the wave. This motion is perpendicular to the wave direction and is characteristic of electromagnetic waves such as light. The vibration of particles allows the wave energy to propagate through the material in a transverse direction.
Compressional Waves
Longitudinal waves have movement that is parallel to the direction of the wave. As the wave travels, the particles of the medium vibrate back and forth in the same direction that the wave is moving. Examples of longitudinal waves include sound waves.
a compressional wave
The wave in which particles move back and forth at right angles to the direction of travel is called a transverse wave. This type of wave is commonly observed in phenomena such as light and electromagnetic waves.
In a transverse wave, matter in the medium moves perpendicular to the direction of wave propagation. This means that the particles of the medium move side to side or up and down as the wave passes through.
Transverse waves are waves in which the particles move back and forth perpendicular to the direction of the wave. Longitudinal waves are waves in which the particles move back and forth parallel to the direction of the wave. Sound waves are an example of longitudinal waves, where air particles vibrate in the same direction as the wave travels.
Longitudinal wave. (as opposed to Transverse waves, where the vibrations are perpendicular to the direction of movement.)
Sound waves oscillate parallel to the direction in which the wave travels. This means that the particles in the medium vibrate back and forth in the same direction as the wave itself, creating areas of compression and rarefaction as the wave propagates.
In a transverse wave, the particles of matter in the medium vibrate perpendicular to the direction of wave propagation, which means they move up and down or side to side. This is unlike in a longitudinal wave where the particles vibrate parallel to the direction of wave propagation, moving back and forth in the same direction as the wave travels.
As the sound wave travels through the air, the air particles vibrate back and forth in the direction of the wave, transferring the sound energy.
This describes a mechanical wave, where matter oscillates in the same direction as the wave propagation. An example of this is a water wave as the water moves up and down in the direction of the wave.