Question

what is wavelength in Physics

Answer 1

Wavelength, distance between corresponding points of two consecutive waves. ... Wavelength is usually denoted by the Greek letter lambda (λ); it is equal to the speed (v) of a wave train in a medium divided by its frequency (f): λ = v/f.

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Answer 2

Wavelength is the distance between identical points in the adjacent cycles of a waveform signal propagated in space or along a wire, as shown in the illustration. In wireless systems, this length is usually specified in meters,centimeters, or millimeters.  In the case of infrared, visible light, ultraviolet, and gamma radiation, the wavelength is more often specified in nanometers (units of 10-9meter) or Angstrom units(units of 10-10 meter)

Wavelength is inversely related to frequency. The higher the frequency of the signal, the shorter the wavelength. Iff is the frequency of the signal as measured in megahertz, and w is the wavelength as measured in meters, then

w = 300/f

and conversely

f = 300/w

Wavelength is sometimes represented by the Greek letter lambda.