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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
radiotech wrote ...
It just might be the most of our universe is composed of stuff that that has no electrons. It is quite easy for a hydrogen atom to lose the only one it has.
That makes it a proton, which is also charged and so radiates when accelerated, etc.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Pinky's Brain wrote ...
wrote ...
If all EM waves can only be created by the acceleration of charges, what then would the acceleration of the charge be, that produced a square EM wave?
Can't be done ... a square EM wave is actually just a summation of coherent light of different wavelengths, the photon can only emit one photon at a time.
I think you're misunderstanding the bit about acceleration. Now I have a purely conceptual understanding of QM, because I'm far too lazy to do all the math ... but AFAICS it's not the vibration of the electron which generates the EM, it's the quantum leap from one velocity to another which generates the photon (in essence the velocity step is stochastic and thus generates a photon of random wavelength, but the wavefronts of acceleration/deceleration set up in the antenna cause amplified stimulated emission ... antennas have a lot in common with lasers).
It's the change in velocity that causes photon emission. Particles in a cyclotron/synchrotron emit photons as they change direction, moving in a circle. (velocity is 'speed in a given direction'). The speed doesn't necessarily need to change in order for photons to be emitted.
(I'm just clarifying a point, not disagreeing with what you say)
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
After seeing the arc radiation hazard thread it occurred to me that this might be true for micro discharges in vacuum as well and be caused not by impacts but by bremmstrahlung. There are some indications that discharges in a vacuum can cause can cause radiation up to x-rays even without an impact target.
If so it might be possible to have a tube with alternating electrodes causing alternating barrier discharges form a free electron laser without an accelerator. I imagine having the bare electrode consist of a peaked surface would increase the number of high energy electrons due to field enhancement. (This idea is either too naive to be possible, or too good to be original.)
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
The end of the thought experiement that started this thread is wondering whether as you turn the frequency of your radio transmitter up, light starts coming off the aerial (I paraphrase).
I find the other end just as fascinating. I look at my DC, audio or microwave circuit and try to imagine it described as photons rather than continuous waves or voltages. Just as head-scrambling. Where are your square waves and sine waves then?
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Dr. Slack wrote ...
The end of the thought experiement that started this thread is wondering whether as you turn the frequency of your radio transmitter up, light starts coming off the aerial (I paraphrase).
I find the other end just as fascinating. I look at my DC, audio or microwave circuit and try to imagine it described as photons rather than continuous waves or voltages. Just as head-scrambling. Where are your square waves and sine waves then?
Since i became aware of 'the search for the Higgs Boson' a few years ago I realised that 'everything' can be explained in terms of waves, except whatever it is that gives things 'mass'.
What started me on this 'train of thought' was the wave/particle duality of something with no 'rest mass', ie the photon.
(The neutrino also has no mass, unless it is interacting with 'matter', whatever 'matter' is.)
I understand waves and how they work (since I discovered Nikola Tesla), but I still have no idea why 'matter' has 'mass'.
(maybe this is slightly 'off topic', but the thread is titled 'I was thinking.....')
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I was thinking...
