Recent content by Ahmes

Hi, From what I understand the proof of Gauss' law applies only to finite surfaces. Can anyone give an example of a charge distribution and an infinite Gaussian surface, where the total flux on it is not proportional to the enclosed charge? Thanks!

I don't really get the hint... Do you suggest that a liquid phase can be treated through the Van der Waals equation? (Not that I see how it helps so fast) After more searching I truly doubt now that a general formula like the Maxwell-Boltzmann speed distribution exists at all... Am I wrong?

If I'm a small particle in a liquid in temperature T, molecules from every direction collide in me f times per second, what is the probability that I'll collide with a particle with energy ε? What is the average energy for collisions? I think I can rephrase it to "how many times per second...

OK, the process is detectable if the resultant particles are charged. Let's say they really are a pi- and a proton. u ----->---- u d ----->---- d 000000000-->-- u gluon? ---< 000000000--<-- ubar d ----->---- d 00000| 00000|Z 00000| ν ----->---- ν (Don't notice the white...

Hi, We were told in a very-elementary elementary particles course, that a neutral current event was first observed in the following process: \bar{\nu}_\mu + n \longrightarrow \bar{\nu}_\mu + X were X is "something other than muon" (n was a neutron). I thought about it, and I don't know how X...

Homework Statement Is the following reaction possible? If so, what is the type of interaction (EM, weak or strong)? p+\bar{p}\rightarrow\pi^+ + \pi^- + \pi^0 Homework Equations Conservation laws and rules of thumb regarding types of interactions. The Attempt at a Solution I don't...

Never mind, I wasn't the first to be upset by it: http://www.dms.uaf.edu/~bueler/M611heaviside.pdf But giving such thing in QED in plain wrong.

Homework Statement The following integral is given: \int_{0}^{\infty} e^{ikx} dx k & x are real. Homework Equations We know that: \int_{-\infty}^{\infty} e^{ikx} dx=2\pi \delta(k) The Attempt at a Solution The answer is: \mathcal{I}=\pi \delta(k) + i \frac{1}{k} I could easily...

You do know it is gauge dependent, right (The formula you brought works for Coulomb)? I don't know about the example you talked about.

Yes, you were right about the magnetization m (that we know from our daily lives, which is produced by currents only) being a cross product. But I'm still not convinced that if magnetic monopoles exist, they act like a single pole. I don't see why they shouldn't be exactly symmetric to electric...

But that's a circular argument :confused: - Why is B a pseudovector? - Beacue it is a cross product. - What if a magnetic monopole exists? - Then it acts like half a dipole and therefore a pseudoscalar. - But there's no fundamental difference between E dipole and B dipole - Yes there...

I can't see why there is a difference... The electric field of an electric dipole is: \vec{E}=\frac{1}{4\pi\epsilon_0} \frac{3\hat{n}(\hat{n}\cdot\vec{p})-\vec{p}}{x^3} The magnetic field of a magnetic dipole is: \vec{B}=\frac{\mu_0}{4\pi} \frac{3\hat{n}(\hat{n}\cdot\vec{m})-\vec{m}}{x^3}...

These links might help:

Radio Frequency (I think it means that here, not sure)

In mine too, however, they are taught simultaneously. Also many staff members criticize the decision to teach QM before a better coverage of Analytical Mechanics. The question itself is interesting - I suppose one can define a force operator as the time derivative of the momentum operator...