Recent content by God Plays Dice

1. I Pair production proximity

Does anyone know how close a photon needs to be to a nucleus (an ion really, no shielding from electrons) for pp to occur? I assume it's a probability as a function of distance, any ideas/equations? Thanks
2. Refractive index of BEC

Does a BEC still have a very large refractive index for X Ray's and gamma rays?
3. Free electron laser weapon -- operating wavelength for the US navy's 1MW FEL?

I know fel operate a wide range of wavelengths, but does anyone know the main operating wavelength for the US navy's 1MW fel?
4. Destructive interference at a surface

It's a standing wave, with electric and magnetic field 90 degrees out. When two waves are directed at each other that's what occurs
5. Destructive interference at a surface

Sry it is a magnetic standing wave (it does move) but has a node at the mirror
6. Destructive interference at a surface

I don't see where there will be constructive interference. At the mirror surface I certainly can't see it, apart from the magnetic fields as they are at an angle to each other and as you make the angle closer to 0 they cancel. however along the beam I can see the electric fields cancelled and...
7. Destructive interference at a surface

Is just like when two waves cross over each other and cancel

Why not?
9. Destructive interference at a surface

Take two lasers of the same intensity and wavelength and aim them at 30 degrees at the same spot on a mirror, so that at the surface the waves cancel perfectly. What happens? How can the wave be reflected if there is no field present?
10. Quantum tunneling instantaneous

http://m.phys.org/news/2015-05-physicists-quantum-tunneling-mystery.html Does this mean that the tunnelling time was actually zero, and the electron 'skips' over the gap, or does it mean that the electron wave travelled at the speed of light followed by an instantaneous jump later on
11. Light interaction with charged particles

Does anybody know what happens when say a laser accelerates charged particles? Do photons get absorbed and the intensity of the laser drops, or do they get absorbed and scattered and there's a redshift of the photon etc
12. Wave particle duality

Possible that the em wave divides into a range of frequencies, some lower, and these get used for acceleration?
13. Wave particle duality

It would have to be Compton/ Thomson scattering, however this is a different process entirely to a charge in an electric field and I don't think you can just neglect the latter
14. Wave particle duality

As far as I know, individual photons do diffract. However the question was not do they diffract, but how does the wave cope with running into say, a free electron. It's electric field would accelerate the electron but that would take energy. So obviously the photon isn't sub divided. I can't see...
15. Wave particle duality

In the single slit experiment, individual photons may be diffracted. The electric field of the em wave should accelerate charged particles in the screen (if it were a capacitor for example) but only one packet of energy exists. The photon may be absorbed after many wavelengths of light have...