0 Members and 1 Guest are viewing this topic.
How to create a photon source using electromagnetic field?
I would need a source of photons with a frequency greater than the frequency of light.
The cheapest and simplest source of photons at higher than visible frequencies are the Ultraviolet "Black Light" lamps that were once popular in discos and theme park rides. These tubes can be installed in a normal fluorescent light. For short exposures, they make your white socks glow.
I would like these photons as propulsion for spacecraft using rotating magnetic field.
Quote from: jaiii on 12/11/2013 17:43:56I would like these photons as propulsion for spacecraft using rotating magnetic field.There's really no such thing as a rotating magnetic field. All too often people make the mistake of thinking that electric and magnetic fields move, and they can't. This misunderstanding comes from the fact that there are sometimes useful to think of the fields as moving such as in visualizing magnetic field lines "cutting" across a conductor.To see how you can get into trouble with moving field lines think of a rotating magnet. In the past some physicist took this moving field lines literally and tried to apply it to the action of the field of a rotating magnet. This implies that at certain distaces from the magnet the magnetic field would be moving faster than the speed of light. One astrophysicist thought that meant that the action of the rotating magnet didn't apply to distances that far away and called that distance the "light cylinder". He was trying to apply this to the magnetic field of a rotating neutron star. When one trieds to calculate the divergence of the field when one attempts to do it this way an error resuts.
Faraday observed the laws of Science, why a rotating magnetic field induces an electric field isn't really known,....
there's no such thing as a rotating magnetic field.