wavelength

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Wavelength
In physics, wavelength is the distance between repeating units of a propagating wave of a given frequency. It is commonly designated by the Greek letter lambda (λ). Examples of wave-like phenonomena are lightwater waves, and sound waves. In a wave, a property varies with the position. For example, this property can be the air pressure for a sound wave, or the magnitude of the electric or the magnetic field for light. The wavelengths of frequencies audible to the human ear (20 Hz–20 kHz) are between approximately 17 m and 17 mm, respectively. Visible light ranges from deep red, roughly 700 nm to violet, roughly 400 nm (430–750 THz). For other examples, see  electromagnetic spectrum.
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Longueur d'onde
La longueur d’onde est une grandeur physiquehomogène à une longueur, utilisée pour caractériser des phénomènes périodiques.
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Wellenlänge
Als Wellenlänge, Symbol λ (griech.: Lambda), wird der kleinste Abstand zweier Punkte gleicher Phase einer Welle bezeichnet. Dabei haben zwei Punkte die gleiche Phase, wenn sie sich in gleicher Weise begegnen, d. h. wenn sie im zeitlichen Ablauf die gleiche Auslenkung (Amplitude) und die gleiche Bewegungsrichtung haben. Bei Wasserwellen entspricht die Wellenlänge zum Beispiel dem Abstand zweier benachbarter Wellenberge oder Wellentäler. Sie ist das räumliche Analogon zur Periodendauer.
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Dlugosc fali
Długość fali - najmniejsza odległość pomiędzy dwoma punktami o tej samej fazie drgań (czyli pomiędzy dwoma powtarzającymi się fragmentami fali - zob. rysunek). Dwa punkty fali są w tej samej fazie, jeżeli wychylenie w obu punktach jest takie samo i oba znajdują się na etapie wzrostu (lub zmniejszania się). Jeżeli w jednym punkcie wychylenie zmniejsza się a w drugim maleje, to punkty te znajdują się w fazach przeciwnych.
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Lunghezza d'onda
La lunghezza d'onda è la distanza tra punti ripetitivi di una forma d'onda. Viene comunemente indicata dalla lettera greca lambda (λ).In un'onda sinusoidale, la lunghezza d'onda è la distanza tra i picchi: L'asse x rappresenta la distanza, e I indica qualche quantità variabile (ad esempio la pressione dell'aria per un onda sonora o la forza del campo elettrico o magnetico per la luce), ad un dato tempo come funzione di x.La lunghezza d'onda ha una relazione inversa con la frequenza, il numero di picchi passati in un dato tempo. la lunghezza d'onda è uguale alla velocità dell'onda divisa per la sua frequenza. Quando si ha a che fare con la radiazione elettromagnetica nel vuoto, questa velocità è la velocità della luce c, e la conversione diventa,
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