Recent content by cooev769

So I have just been reading up on statistical thermodynamics and have no idea why the bose-einstein, fermi dirac and maxwell boltzman are all integers, that makes sense, but then when you make the degenerate correction to the maxwell Boltzmann by dividing by N! we get decimal answers. Why is...

True let me have another go :)

Homework Statement So the first part asks to prove the time derivative of kinetic energy is dT/dt=F dot product v which I did not problem. but then the second part of the problem asks to prove that if the mass is changing with time then the time derivative of d(mT)/dt=F dot product m and I'm...

Solved I was adding the two instead of subtracting them. I can do electrodynamics but I can't do simple addition. Time to go and cuff my primary school teacher.

Homework Statement So I'm doing a question from one of my past exams as attached, there are no copy right issues with this document that I know of and have asked my lecturer who wrote the exam and he said I am welcome to upload it. The question is 1)b)iv), my attempt is attached. I end up with...

Hey I'm having an issue deriving the calculus of variations because the chain rule i use ends up different to the one in the textbook. Firstly I assume we have some function of 3 variables Y=y+alpha eta with grad Y'=y'+alpha eta' and x. Secondly we have an integral of this function over x and...

I'm having a little trouble understanding why the Coriolis force is proportional to the velocity vector of the object in the rotating frame. It seems to me if you had a spinning cd for example and let a ball go on it, if the ball was moving slower from the inside to the outside it would divert...

So i don't really understand why the change in momentum of a crystal involves a reciprocal lattice vector. Surely it is just the change in momentum due to the change in the number and frequency of the phonons before and after whatever event/scattering/collision takes place. Can somebody please...

As I thought. But I'm not quite sure what a phase factor is or where it is coming from.

I know about symmetry and antisymmetry and so on, but a thought that I had never considered just hit me. If we had two fermions in the triplet symmetric spin state and hence therefore an antisymmetric spatial state, for example a harmonic oscillator in the first excited state must be one in...

I've come across a question which as really stumped me because I thought I knew how to do this but apparently not. The question is that we have a tangent vector to a level curve of a function of two variables f(x,y) at a point P is (2,1). Hence by my logic this means grad of f x unit vector...

I disagree. Just because something is hasn't proven to be wrong doesn't make it true. If Einstein had accepted the classical model as the nature of the universe because it had been proved correct many times over then relativity may not even exist. I can't like Einstein just accept the fact that...

Thanks nugatory, that's a conceptual barricade that has been annoying me for a long time and I believe I finally understand it, as well as it can be understood anyway.

Yeah well it helps that I personally think Bells inequality is fallacious and that quantum mechanics is most likely missing something, so I don't really feel the need to understand something I don't believe is the true nature of the universe.

Thanks so much for the answers I think I understand it now. So When you collapse the wave function for example into the eigenfunction of the Sx operator in the Sz basis by passing it through a stern gerlach aligned with the x-axis and then Th rough one aligned with the z axis, the spin can no...