Recent content by Keru

I have some difficulties interpreting an exercise. It states that the dibaryon H is made of uuddss, with total spin zero, and relative angular momentum 0 as well. It then proceeds to use that the spin of every pair of particles uu, dd, and ss is equal to 1. Why is that the case? It seems obvious...

In terms of position operators it is: W = 2z2 - x2 - y2 and it comes from the electric cuadrupole. So, there's something I'm not getting right then. I'll try to translate the exercise as precisely as possible: "Determine the matrix of W in the base given by the states of the first energy...

"Given a 3D Harmonic Oscillator under the effects of a field W, determine the matrix for W in the base given by the first excited level" So first of all we have to arrange W in terms of the creation and annihilation operator. So far so good, with the result: W = 2az2 - ax2 - ay2 + 2az+ 2 -ax+...

Homework Statement The exercise asks many questions about the following E(k) diagram, but I'm more interested in understanding some basic things about it, from which I'm sure i'll be able to find the answers I'm requested. 1) What do the bands actually correspond to? Is the lowest band...

Ok I think i got it. So, for one of the two possible cases it would continue like this?

Homework Statement (c is a constant) The attempt at a solution -In the first measure we got a1, so the state of the system would be psi1. -In the second measure, there's no information about what eigenvalue we got. Would the state of the system still be psi1? Psi1 is written in terms of B...

Ok, I finally got it. Had a confusion with the basis, but now i know what I was getting wrong. I'm still a newbie at QM, thanks for the patience and for the help, you have my sincere "like" ! (Thread can be closed now i guess)

Sure. $$ V_1= \frac {1} {\sqrt{3}} (-1 - i, 1, 0) $$

Wouldn't that be Vi?

Yes, i meant ground state. I translated it wrong from Spanish. I know the chances of getting every possible measure are |ai|2, and that ai = <Vi|V>. But I'm not sure what "V" is. I guess it must be a vector in order to get a scalar from the product, but what i (possibly wrongly) understand, is...

Homework Statement Given the following Hamiltonian: And the observable: Calculate the probability of measuring any of the possible values of A in the fundamental state. The attempt at a solution I have calculated the eigenvectors and eigenvalues of the Hamiltonian, being the eigenvalues...

I heard from a teacher at University, he said something like "let's suppose that the electron and the proton have exactly the opposite charge even though that's not exactly true". I didn't have the chance to ask him which was the difference and I didn't want to wait until Monday to know. I also...

Hey guys, I understand it would be logical for electron and proton to have the same charge but with opposite signs... Why then is there a smalll difference between their charges? Thank you

Yes i meant ∇×. Sorry I am not english native speaker, searched for the translation and that's the best i had.

Two quick questions. Does the Coriolis effect mean that in the northern hemisphere the curl will always have a negative value and in the southern hemisphere a postive one? Is the curl in the eye of the cyclones equal to zero? Thanks.