wavelength

- 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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