but how these electric field get generated?could you please explain this concept?stefan r said:There is no charge traveling with the photon.
When a photon is adsorbed it can move an electron. The electron has a charge.
A changing magnetic field will create an electric field and vice versa; this is described by Maxwell's equations. Thus, if you can accelerate a charge in a way that starts the electrical and magnetic fields changing, the change will continue to propagate.Kaushik Classes said:but how these electric field get generated?could you please explain this concept?
I wouldn’t say that they get generated in vacuum. They get generated by charges, and then they propagate through vacuum. This is described by Jefimenko’s equationsKaushik Classes said:But i don understand how these electric and magnetic fields get generated in vacuum.
Agree with you . as once they are generated electric and magnetic field sustain each other and they progress.Dale said:I wouldn’t say that they get generated in vacuum. They get generated by charges, and then they propagate through vacuum. This is described by Jefimenko’s equations
https://en.m.wikipedia.org/wiki/Jefimenko's_equations
https://en.m.wikipedia.org/wiki/Maxwell's_equationsKaushik Classes said:so how does the sun light travel
Primarily black body radiation.Kaushik Classes said:and what is the mechanism that generate the electromagnetic wave from sun?
But first of all, an electric field can exist in a vacuum somehow. And so can magnetism.Kaushik Classes said:Agree with you . as once they are generated electric and magnetic field sustain each other and they progress.
Electromagnetic (EM) waves are a type of energy that propagate through space at the speed of light. They are created by the oscillation of electric and magnetic fields, which are generated by charged particles. In free space, these charged particles can be either natural sources like the sun or artificial sources like radio antennas.
When charges are accelerated or decelerated, they create a changing electric field, which in turn generates a changing magnetic field. This process continues and results in the creation of an electromagnetic wave that propagates through free space. The strength and frequency of the oscillations determine the characteristics of the EM wave.
Yes, all charges generate EM waves in free space as long as they are in motion. Even the slightest movement of charged particles can create an EM wave, although the strength and frequency may be too low to be detected by our current technology. However, only charges that are accelerated or decelerated at a certain rate can generate EM waves that are strong enough to be detected.
No, EM waves cannot be generated without charges in free space. As mentioned earlier, the creation of EM waves requires the oscillation of electric and magnetic fields, which are generated by charged particles. Without charges, there would be no electric or magnetic fields to oscillate and thus no EM waves can be produced.
There is no theoretical limit to the frequency of EM waves that can be generated by charges in free space. However, in practical terms, there are technological limitations in detecting and using EM waves with extremely high frequencies. The highest frequency of EM waves generated by natural sources is in the gamma-ray range, while man-made sources can generate EM waves in the terahertz range.