Recent content by secret2

I don't know if this question should be posted here, but I'll give it a shot anyways. I am trying to find f(x,y), which can be obtain by doing the backward Fourier integral to F(\omega_x, \omega_y). I have 2 questions. 1. Is there any Fortran code that could evaluate the (numerical)...

I have a question about insulator. The story starts from the fact that, taking a 1-D model, there are N possible values of wave vectors k within the first Brillouin zone [becasue number of possible k's = (2*Pi/a)/(2*Pi/L) = L/a = N where L is the length of the crystal, a is the distance...

I am quite confused by some aspects of thermodynamics. First of all, I just wonder, when the textbook says that "when the constraints are temperature, volume and particle number, minimise F for equilibrium" (and similar statements for G and H), does it mean that the temperature, volume and...

Please Help! (Special relativity) Hi everyone, I am stuck at a really straight-forward problem about SR: In a beam of antineutrinos, it is proposed to search for tau anti-neutrino via their interactions on protons in a stationary target to produce anti-tau particles. (a) Calculate the...

In fact, I am working on a variational method problem. I am asked to prove that any finite square should have at least one bound state. So I plug in a Gaussian trial function to the square well potential. The variational method give neatly V (which is the "depth" of the well). Just want to check...

Is there any website where I can find the analytic form of the eigenenergy of a 1-D finite square well potential?

Maybe there is some sort of simplified answer for it? The question is suppoesed to be a relatively short one...

Is anyone familiar with Breit-Wigner Cross section? Say, for a reaction with 2 particles in the initial state, 1 intermediate and 2 final: \sigma = \frac{g \pi \lambda^2 \Gamma_i \Gamma_f}{(E-E_0)^2 + \frac{\Gamma^2}{4}} I can't see why for the wavelength we should use the momentum of...

For a sphere moving through an incompressible fluid, what is the condition for cavitation to occur?

Thanks Clive. But wouldn't using Gauss Law introduce a factor of 4*Pi? The answers have no 4*Pi in it. And do I have to consider also the pressure and the boundary condition? By the way, here's the answers provided: V = (1/2)G rho (z)^2 |z|<a = G rho a (|z| -...

Now I think I understand. When diagonalizing the system, we turned the two INTERACTING SHO's into two non-physical NON-INTERACTING symmetric and anti-symmetric modes, and they just act like any other SHO's. The zero point energy of the system is the sum of the zero point energy of the two...

Thank you!

If I have an infinite slab of incompressible self-gravitating fluid of density rho within the region |z|<a, and I am asked to find the potential both inside and outside the slab, where should I start?

Of course, of course. And my question is why NOT exclude the anti-symmetric mode, which has higher energy than the symmetric mode alone?

It's from one of the problem sheet for the condensed matter course. I just wonder if the zero point energy is defined to be as mentioned.