Longitudinal waves are waves that have the same direction of oscillations or vibrations along or parallel to their direction of travel, which means that the oscillations of the medium (particle) is in the same direction or opposite direction as the motion of the wave. Mechanical longitudinal waves have been also referred to as compressional waves or compression waves.

Plane pressure wave Representation of the propagation of a longitudinal wave on a 2d grid (empirical shape)

Non-electromagnetic

Examples of longitudinal waves include sound waves (alternation in pressure, particle displacement, or particle velocity propagated in an elastic material) and seismic P-waves (created by earthquakes and explosions).

Sound waves

In the case of longitudinal harmonic sound waves, the frequency and wavelength can be described with the formula

where:

  • y is the displacement of the point on the traveling sound wave;
  • x is the distance the point has traveled from the wave's source;
  • t is the time elapsed;
  • y0 is the amplitude of the oscillations,
  • c is the speed of the wave; and
  • ω is the angular frequency of the wave.

The quantity x/c is the time that the wave takes to travel the distance x.

The ordinary frequency termed as f, in hertz, of the wave can be found using

For sound waves, the amplitude of the wave is the difference between the pressure of the undisturbed air and the maximum pressure caused by the wave.

Sound's propagation speed depends on the type, temperature and pressure of the medium through which it propagates.

From Wikipedia under the GNU Free Documentation License
Wed Jan 6 04:54:32 2010

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See also:

  • Astar Shamir, Voice HealerAstar Shamir, Voice Healer
    voice-healing.com
    Voice Healing uses one's own voice to induce healing. Classes. Multilingual site. Rishpon, Israel.
  • Sound Wave EnergySound Wave Energy
    harmonyera.com
    Holistic approach to wellness through the use of sound frequencies. Founded by French-Canadian Nicole La Voie.
  • The Order of the Blue StarThe Order of the Blue Star
    soundhealing.org
    Workshops, lectures and teachings by Christopher Tims on longevity, health, vitality and the use of sound and its implications on the physical and spiritual being. Hot Springs, Arkansas.
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Sun Feb 7 00:15:08 2010