Recent content by leviadam

Ah, now I get it. It's funny, you can learn QFT and GR but you realize you sometimes have shortage in fundamental physics... 10q very very much.

The force you have calculated is the force downwards. I'm not sure it is the same answer for the sides of the cylinder. How is it reasonable that the pressure downwards is the same as the pressure to the sides. Adam.

Hi all, I was asked today by a friend a simple question but couldn't answer so I'm asking you. Let's assume we have a vertical cylinder full of water, what is the pressure on the sides of the cylinder? If it was the pressure downwards it simply L*g*rho but to the sides I'm not sure... 10x a...

alxm, you seem to know the phenomena, can you think of a book that has the full derivation?

This is a quantum field of course, and is represented with ladder operators , so when you have A2 you get a product of two ladder operators that creates two photons. Adam.

It comes from the A2 operator in the Hamiltonian, all the dipole and quadrupole etc comes from A*P, when A*p is possible A2 is neglected. In 2s->1s A*p is impossible so there has to be a two photons emission. Adam.

You are correct my friend, physics is all about the creation of mathematical models that represents nature best, as long as the the theory predicts the tunneling and the electron tunnels there is no problem, the theory do not have to answer questions like why. Of course one might find a batter...

Hi all, I'm doing a project that includes an hydrogen 2s->1s decay and I need the full derivation of this process, so if anyone can recommend about a book it would be great. I first thought it should be easy to find but to tell you the truth I have looked and found scratch. 10x a lot...