• The distance from peak to peak of a wave, whether of matter or of radiation. Multiplying wavelength by frequency yields a wave’s velocity.
  • For a periodic wave, such as an electromagnetic wave, the distance between any point having a given phase, and the point having the same phase in the next cycle. It is the length of a complete cycle, and is usually measured from peak to peak, or from trough to trough. In the case of electromagnetic radiation traveling through space, it is equal to the phase velocity divided by the frequency. Usually expressed in meters or fractions/multiples of meters such as millimeters or kilometers. Its symbol is Λ.
  • abbreviation lambda (λ)
  • Symbol for linear charge density, or charge density (3).

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