Recent content by joker_900

Mainly I don't get how plasma loses energy by conduction, which is what I have read. Is it just from the collisions between plasma particles and the wall? Thanks!

Homework Statement It commonly happens that the hyperfine structure in a transition is dominated by the contribution of an s-electron in one of the levels. What property of s-electrons could be responsible for this? A transition of this kind occurs at 494nm in singly ionised 133Cs between a...

Hi, I need to learn about nuclear fusion and how the Tokamak works. Can anyone recommend any books/texts/websites that would be useful? I am a 3rd year Physics undergrad and have done a reasonable amount of EM, to give you an idea of the level - I don't want a layman explanation but also not...

Homework Statement A particle of charge q and mass m is in a harmonic oscillator potential V0=0.5m(wx)^2. A perturbation is introduced which changes the potential to V=V0 + dV with dV=0.5sm(wx)^2 where s is small. Use perturbation theory to compute the first order shift in the ground state...

Homework Statement Hi, I've been given a problem set and there is suddenly new notation that I've never seen. Can anyone shed any light on what this means: "Treating a0 as a parameter, write down the complete wavefunctions (including radial and angular parts) for the states 1s, 2s, and 2p...

Homework Statement In the rotation spectrum of 12C16O the line arising from the transition l = 4 -> 3 is at 461.04077GHz, while that arising from l = 36 -> 35 is at 4115.6055GHz. Show from these data that in a non-rotating CO molecule the intra-nuclear distance is s ~ 0.113 nm, and that the...

Thanks, but I still don't see how to do the question at all. Are the pages right - do they change with editions?

Homework Statement The matrix R(q) for rotating an ordinary vector by q around the z-axis is given by@ cosq -sinq 0 sinq cosq 0 0 0 1 From R calculate the matrix J(z). Homework Equations -The Attempt at a Solution All I know is that U(q) = exp[-iJ(z)q] is the unitary...

Thanks for replying But if the field is proportional to r^(-2) and in the r direction, then divE is just the differential of r^(-2) wrt r. Which is proportional to r^(-3). So at some point r=a outside the sphere, divE=a^(-3), not zero. I still don't understand

Homework Statement I just have a little question about Gauss' Law (differential form). If divE = p/e0 where p is the charge density and e0 is permittivity of free space. But if we had a sphere with a total net charge of Q, then outside the sphere, the field is E=k/r^2 I think. Then...

I had a look at that chapter, thanks. It seems I can show that the Hamiltonian of both situations are the same fairly trivially. But then this doesn't use the states at all. Hmm

Homework Statement Consider a system of two particles of mass m that each move in one dimension along a given rod. Let |x> be the state of the first particle when it’s at x and |y> be the state of the second particle when it’s at y. A complete set of states of the pair of particles is...

But in the two slit experiment, if you have an amplitude A1(x) that the particle will go through slit 1 and hit x, and A2(x), then the probability of it hitting x is given by |A1(x) + A2(x)|^2 which gives an interference term. What is the difference here? Thanks

Excellent, thanks. I have one more question, and that's it I promise! If you can write |\psi> = Sum{ai |Ei>} where ai is the amplitude of a measurement yielding the value E1 (which is an eigenvalue corresponding to the eigenstate |Ei>). Then what is the probability of the measurement...

Homework Statement The eigenstates of two commuting operators A and B are denoted |a,b> and satisfy the eigenvalue equations A|a,b>=a|a,b> and B|a,b>=b|a,b>. A system is set up in the state |psi> = N(|1,2> + |2,2> + |1,3>) What is the value of the normalization constant N? A...