(Lamda) is the distance between two adjacent points on
the wave, which have the same phase.
As an example (see figure 1.1 below) the distance between two adjacent
peaks of the wave.
In a parallel way it is possible to define a wave by itsfrequency.
Frequency (n)(nu) is defined by the number of times that the wave oscillates per second (The number of periods of oscillations per second).
Between these two parameters the relation is:
From the physics point of view, all
electromagnetic waves are equal (have the same properties) except for their
wavelength (or frequency).
As an example: the speed of light is the same for visible light, radio waves, or x-rays.