Coherent waves in the electromagnetic spectrum are produced by masers, for microwaves, and lasers, for light.
The wave is a Tsunami
It is movement of land beneath the sea, often it is a land slide that displaces water and produces the wave.
First let us remove the word visible from this question and replace it with incoherent, as visible light can be either coherent or incoherent and coherent light can be either inside the visible spectrum or outside it.Incoherent light is random/unordered, e.g. wave phases different, shines in all directions, polychromatic.Coherent light is ordered in one or more ways, e.g. wave phases all synchronized, shines in one unidirectional collimated beam, monochromatic.The difference between light in the visible spectrum or outside it is only whether humans can see it or not, there is no difference in the light itself other than wavelength.
The question founders on the rocks of a chicken/egg conundrum. The presence of both an electric field and a magnetic field is required in order to produce an electromagnetic wave.
There are two types of coherence time and space coherence. Time coherence means that the wave phase stays constant in time. Space coherence is when the wave phase is a constant when light travels in space. Both are really important and can be found in lasers and other sources of electromagnetic radiation.
The name of the device that produces coherent light is LASER.
The official definition for the word 'coherent waves' is "a superpositioned wave that does not interfere with other waves in the conductance pathway."
A laser is a device to produce an intense monochromatic beam of coherent light.
two coherent light sources are produced by splitting a single light source
No. Lasers produce coherent light.
they produce protons and electrons they are collition then the light produce and heat produce
it's micro wave
Sound wave
longitudinal wave
electric wave
The wave is a Tsunami
Square Wave