Recent content by colegu

Now I'm in vacation, so in ~10 days I will ask a teacher here and see what he can do. thanx alot.

Thanx for the comments. Especially the link, which is a verry good read. However, I have some other questions regarding this problem, but I must learn much more about what phonons are, and what are their properties(because i know almost nothing about them) Apparently, photons move slower in a...

Thank you all, you all helped my clarify some things. marlon, i cannot retrieve the reference you gave me since it asks for an user and password, which I don't have. I'm not studying in US, btw.

I got it, but I asked what is the difference between the electrons in the metal and those outside the metal. The difference must be the wavefunction, so the exclusion principle must apply to identical fermions with the same wavefunction? I don't think I have made myself clear enough. sorry...

I know that in vacuum light travels with the speed c. But in different materials(eg water) the spedd is lower than c. I wanted to know what's happening that the speed decreases, and didn't came to a conclusion. given the energy of the photon ε=hf=√(m_0²c⁴ + p²c²)=pc=M·v·c since the rest mass...

I'm sort of confused right now, so, given an electron in a crystal with a given quantum state, there is no other electron in the same quantum state in the same crystal or everywhere? I may sound stupid, but to me these postulates, and physical explanations are more important than mathematical...

The principle is inherent to identical fermions, but what is the difference between the quasi-free electrons from the metal cable , and those who are strongly bounded to the nuclei, or the electrons from the materials surounding the metal cable. is it because their wavefunction is different...

It's the second time I've posted this message, and my english simply sux, so excuse me if I will not be able to explain my misunderstanding quite clear. Let's imagine a verry long metal cable, which is heated at one head. The quasi-free electrons at that head, as their energy increases, must...