# Wave

In physics a wave is a disturbance or oscillation that travels through spacetime, accompanied by a transfer of energy. Wave motion transfers energy from one point to another, often with no permanent displacement of the particles of the medium—that is, with little or no associated mass transport. They consist, instead, of oscillations or vibrations around almost fixed locations. Waves are described by a wave equation which sets out how the disturbance proceeds over time. The mathematical form of this equation varies depending on the type of wave.

There are two main types of waves. Mechanical waves propagate through a medium, and the substance of this medium is deformed. The deformation reverses itself owing to restoring forces resulting from its deformation. For example, sound waves propagate via air molecules colliding with their neighbors. When air molecules collide, they also bounce away from each other (a restoring force). This keeps the molecules from continuing to travel in the direction of the wave.

The second main type of wave, electromagnetic waves, do not require a medium. Instead, they consist of periodic oscillations in electrical and magnetic fields generated by charged particles, and can therefore travel through a vacuum. These types of waves vary in wavelength, and include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

Further, the behavior of particles in quantum mechanics is described by waves and researchers believe that gravitational waves also travel through space, although gravitational waves have never been directly detected.

A wave can be transverse or longitudinal depending on the direction of its oscillation. Transverse waves occur when a disturbance creates oscillations perpendicular (at right angles) to the propagation (the direction of energy transfer). Longitudinal waves occur when the oscillations are parallel to the direction of propagation. While mechanical waves can be both transverse and longitudinal, all electromagnetic waves are transverse.

### Other articles related to "wave, waves":

Birefringence - Theory
... Consider a plane wave propagating in an anisotropic medium, with a relative permittivity tensor ε, where the refractive index n, is defined by (assuming a relative ... If the wave has an electric vector of the form (2) where r is the position vector and t is time, then the wave vector k and the angular frequency ω must satisfy Maxwell ... Therefore, for each direction of the wave normal, two wavevectors k are allowed ...
Dark Wave - History - Wave-atypical Influences
... bands mixed elements of dark wave and ethereal wave with later developments in electronic music ...
Dark Wave
... Dark Wave or darkwave is a music genre that began in the late 1970s, coinciding with the popularity of New Wave and post-punk ... Building on those basic principles, dark wave added dark, introspective lyrics and an undertone of sorrow for some bands ... In the 1980s, a subculture developed alongside dark wave music, whose members were called "wavers" or "dark wavers" ...
Wave - WKB Method
... Such nonuniform traveling waves are common in many physical problems, including the mechanics of the cochlea and waves on hanging ropes ...
Kelvin Wave
... A Kelvin wave is a wave in the ocean or atmosphere that balances the Earth's Coriolis force against a topographic boundary such as a coastline, or a waveguide such as the ... A feature of a Kelvin wave is that it is non-dispersive, i.e ... the phase speed of the wave crests is equal to the group speed of the wave energy for all frequencies ...

### Famous quotes containing the word wave:

Now I stand as one upon a rock,
Environed with a wilderness of sea,
Who marks the waxing tide grow wave by wave,
Expecting ever when some envious surge
Will in his brinish bowels swallow him.
William Shakespeare (1564–1616)

“Speaking of contraries, see how the brook
In that white wave runs counter to itself.
It is from that in water we were from
Long, long before we were from any creature.
Robert Frost (1874–1963)

“Justice” was done, and the President of the Immortals, in Æschylean phrase, had ended his sport with Tess. And the d’Urberville knights and dames slept on in their tombs unknowing. The two speechless gazers bent themselves down to the earth, as if in prayer, and remained thus a long time, absolutely motionless: the flag continued to wave silently. As soon as they had strength they arose, joined hands again, and went on.
The End
Thomas Hardy (1840–1928)