A standing wave is the phenomenon resulting from the simultaneous propagation in directions different from several Onde S of the same Fréquence, in the same physical environment, which forms a figure whose certain elements are fixed in time. Instead of seeing there a wave which is propagated, one notes a stationary vibration but different intensity, in each point observed. the characteristic fixed points are called Nœud S of vibration.
The mediums affected by standing waves can be to one, two or three Dimension S; here some examples:
- a dimension
- vibrating Cord
- sound Pipe (at first approximation, of as much better than its diameter is weaker)
- Fiberoptic
- two dimensions:
- Sounding board of the musical instruments
- surface of a water level or a mercury tank
- three dimensions
- interior volume of a church (with respect to the sound of the Organ)
- affected space by luminous interferences
According to the point observed, the vibrations produced by the various waves are added or compensated in a way partial or total, which causes on definite and fixed sites their mutual neutralization (places called “nodes”: the vibrations disappear) or their addition (places called “bellies”: the vibrations are amplified and maximum). The distance separating a belly from the node nearest equalizes the quarter wavelength.
The standing waves can affect all the vibratory phenomena: mechanics, sound, Optical S, electromagnetic S…
The standing waves can be highlighted in many ways: vibrating cords, Tube of Kundt, Interference S sound or luminous, etc
See too
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Propagation the waves
- undulatory Structure of the matter
External bonds
Initiation with the standing waves
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