Interaction Definition and 713 Threads

Say we have two waves of the same amplitude are about to collide with each other. The preceeding wave travels at a slightly higher speed before interacting with the final wave. However, instead of passing through the final wave its speed and size is transferred into the final wave where it...

Homework Statement The general expression for potential energy of a magnetic dipole placed in magnetic field B is given by, E = -m.B Where m=magnetic dipole moment It is given in a book that due to spin orbit interaction, the potential energy possessed...

e^+ e^- \rightarrow \mu^+ \mu^- The reaction above can take place in two different ways: 1) The electromagnetic interaction by exchanging a \gamma 2) The weak interaction by exchanging a Z^0 Can somebody explain which way is more probable and why. I'm not sure but I guess that the...

In Configuration Interaction scheme Why does inclusion of excited states (unfilled states) in the basis set improve accuracy? What is missing in the model which is accounted for by inclusion of suc h virtual states. My guess is the the born-oppenheimer approximation but not sure??

Human interaction for personal gain of each individual.Is that the best summary of interaction between individuals.

I am reading a Cambridge Monographs on Mathematical Physics by Terry Gannon, ‘Moonshine beyond the Monster: The Bridge Connecting Algebra, Modular Forms and Physics’. On page 236 “... Space-time is not the vector space R^4, but rather a nontrivial (curved) four-dimensional pseudo-Riemannian...

Homework Statement Cross-sections for weak interactions at an energy E increase with E as E^2. Show that the rate of weak interactions in the early universe depends on the temperature T as \sigma_{wk} \propto T^52. The attempt at a solution The only formula I can find is \sigma_{wk} = g_{wk}^2...

I've learned that you cannot deal with the interaction of a charge with its own field in classical electromagnetism. It is said, that this is simply the case with classical theory, and you have to deal with it. But how can this be? If accelerating charge is giving energy to the field, then it...

Homework Statement Electric charge is distributed along each side of a square. Two adjacent sides have positive charge +Q on each, two sides have -Q on each. What are the x and y components of the net electric field at the center of the square? (Each side has length "a").Homework Equations...

Hello! I need help with an exercise about the weak interaction: How do the mass, the q-value and the vertices depend on the half-lifetime of a decay? The myon decay has a half-lifetime of 0.0000015 seconds, the neutron decay has a half-lifetime of 607 seconds. Why is there such a big...

Hi, I'm having a little problem understanding why splitting occurs in an atom. For example when you look at the line spectra for Sodium-D, then two lines appear very close together. I understand that there is a magnetic interaction where the magnetic field has been generated by the orbital...

if you have 2 point dipoles p1 and p2 located at r1 and r2 respectively(all four are vectors) what's the energy of p2 in the field of p1? I know the general expression for the energy of a dipole in an external field Eo is U=-p * Eo but from there I get confused I can express the...

Okay i have a physics problem that i really don't get...pliz help me! A 6.0-kg block rests on top of a 7.0-kg, which rests on a horizontal table. a What is the force (magnitude and direction) exerted by the 7.0-kg block on the 6.0-kg block? i tried using the formula F sub a and b = F...

I have been trying to independently learn quantum field theory, and I've been stumped on a few points... Suppose I had an interacting Lagrangian with the following form: L = H(x) PsiBar(x) (a + i b gamma5) Psi(x) where: H(x) is a field in which the Hermiticity condition is imposed...

Considering the decay of certain exotic mesons, such as the following: B^{+} --> D^{0} \pi^{+} Apparently the decay proceeds via a weak interaction where multiple W boson exchanges occur. I was trying to nut out how this actually occurs, and draw up a sensible Feynman diagram...

Two small asteroids orbit each other in circular orbits. The distance between the centers of the two asteroids is 35 m. The mass of the larger asteroid is 3 x 10 6 kg and the mass of the smaller asteroid is 1.2 x 10 5 kg. a. )What is the magnitude of the gravitational force of interaction...

I am sick right now :frown: I just have cold symptoms, sneezing, runny nose, coughing, etc... I took some Sudafed 12 hour with the active ingredient, Pseudoephedrine. Since I took it my nose is running out of control, I am sneezing non stop, it's like someone opened up a faucet (not to be...

Is there such program available for download from the Internet; a program in which you can simulate interactions between elementary particles and atoms. So - it works like this: - you start the program, and there is just empty space (and literaly - it's vacuum (simulation equivalent (a ball...

Let us consider the http://en.wikipedia.org/wiki/Stern-Gerlach_experiment" experiment. The inhomogenuous magnetic field produces a drift force that can separate particles according to their spin and offer a possibility for a "measurement". This (very) small magnetic interaction can be...

Questions, questions, questions... I hope some one can answer these questions. thank you. :) 1. Describe the process of Compton Scattering, explaining carefully how both attenuation and absorption of X-rays occur. 2. How does the process of Compton scattering of X-rays depend on the nature...

Greetings! I've looked around in the FAQ and around the forums and couldn't find the answer to my question, so I've decided to ask. If however I did miss the answer, I apologize. Well, it's quite elementary actually. I am wondering if it is correct to assume that no two solid objects...

There are two electriferous paticles,moving in the same v&direction,then in our opinion,there will be an magnetic effect,but in particles' opinion,there will not be,how to explain it in relativity?:confused: Thanks!

Energy is not an invariant quantity between different frames of reference. For example a particle having a kinetic energy in one frame has a zero kinetic energy in another frame. But what about interaction energy? If I know the interaction energy between 2 particles in one frame, how can I...

In my nuclear physics textbook (from 1988), there's a section which lists properties of the nuclear force, including one section about how the nucleon-nucleon interaction may depend on the momentum or velocity of the nucleons. (It talks mostly about the spin-orbit term, which is V(r)*(r x p) dot...

Hello, Does anyone know why in pionic hydrogen the strong interaction should be attractive whilst in kaonic hydrogen it is repulsive. I have heard it is something to do with a sub-threshold resonance but nothing more. Thanks Sham

I think I understand how signals can be sent by field disturbances, and that the disturbance is propogated at the speed of light. Now, I was wondering about the case where a stationary field is already set up and you place a test charge in that field. Does that charge move instantaneously...

Hi, I'm stuck on the following problem. Can someone please help me out? Q. A bead (particle) of mass m travels along a path described by \mathop r\limits^ \to = a\cos \left( {\omega t} \right)\mathop I\limits^ \to + a\sin \left( {\omega t} \right)\mathop J\limits^ \to + bt\mathop...

Spin Orbit Interaction Hamiltonian is defined as follows: H_{SO}=\frac{1}{2m_{e}c^2}\frac{1}{r} \left(\frac{\partial V}{\partial r}\right)L\cdot S How does one derive the above Spin Orbit Interaction Hamiltonian from relativistic treatment? Is there a good textbook that elaborates on...

I understand the difference between the two main Neutron decays but, is there an observable difference when an electron collides with a neutron compared to a positron colliding with a neutron? In particular, I need to know if there is a difference in the behaviour of the neutron.

Hi, I need some materials or instructions on how to simulate fluid-structure interaction ansys or modeling to finish my research in the next 6 months. Do you know where I can find some source to simmulate the fluid-structure interaction ansys, or places where I can download source? I...

Could anyone please tell me how to calculate quadrupole quadrupole interaction between two molecules having dipole moment zero? As quadrupole is a tensor quantity I get a 3*3 matrix for a molecule.

I've got to find the energy between two dipoles separated by a vector displacement r. I found what the energy/field of one such dipole is (see attachment), but I don't know how to combine the energy of two dipoles (P1 and P2) using those equations.. any help on a starting point? :confused:

The electromagnetic interaction can be described by the exchanche of virtual photons. These photons have a well defined momentum and can therefore be everywhere in space. So gets the em-interaction of two electrons smaller the more they are apart if these photons have no favourite position in...

Hi All, Im' trying for some members of my site toshow atomic interaction force (coulomb...) with some animations. Here is my first trial two ions with same but opposite charges... Is there an acceleration since attraction augments (like I did)? You need Flash player...

I want to gather some links about this. If you know of some good articles and can add some links to the stash, please do. The gravitational field is the geometry of spacetime and can be roughly equated with spacetime itself, or a general idea of the vacuum----the ideas tend to overlap because...

I want to be in a position where I can design hardware, then write low level codes on chips (firmware) to make the hardware adaptable to software. Let's take a dvd player for example, I am thinking that if I have to write firmware so that the hardware and software can interact, I think that I...

After reading quite many popular science about QM, I still didn't get a real understanding of the difference between a so-called measurement and just an interaction (if there's actually any difference). My understanding is that a measurement is an interaction "observed" in a way which allows...

From what i have read, electron energy is not the only thing split into energy levels - also vibrational, rotational and translational energy is quantized. But which part of the atom absorbs the electromagnetic waves which cause these energy levels to increase? Is it still the electrons as with...

There is an analogy of the phenomenon of curvature of space by mass. It is a sheet of rubber with the some mass placed on it. Then the deepening on a sheet is formed and all surrounding objects with only smaller (?) mass should sliding down to the mass lying on a deepening bottom...

Fermi Contact Interaction of Electrons with Nuclei About this interaction, is it the spins of nuclei which interact with the spins of electrons? So, if I draw the magnetic field line from the left nucleus via the pair of e- to the right nucleus and there is not anti-parallel field against...

Upon my recent studies i have discovered various methods of defining mass in various situations. It has come to my attention that mass is somewhat undefined without the use of interacting parameters. Your thoughts?

Excuse me, I'm learning about the genetic interaction and I think I can get pretty much explanation in the Internet but Google didn't seem to be really helpful now. So please suggest me some sites on genetics and I'll try out! Thanks alot!

Could anyone please provide (or start off) the proof of (2.4) of the following document? http://www-its.chem.uva.nl/research/complex_fluids/Teaching/LectureNotes%202004%20vdWaals%202.pdf Many thanks

Hello I have a query (Classical Electrodynamics) regarding Self Energy and Interaction Energy. I understand that the integral definition U_{tot} = \frac{1}{2}\int_{all space}k\epsilon_{0}E^2d\tau = \frac{1}{2}\int Vdq represents the total electrostatic potential energy of a system and...

Does observation really mean interaction?? For example if something didnt interact with something else(for example proton A is far away for anything else) it would be in a superposition but would collapse into a normal state(decoherence) when it interacts(say proton A bumps into electron B)...

In the Residual Strong Interaction, energy and momentum are exchanged not through gluons but through exchange of quarks, for example in the soft hadronic scattering of a pi + and proton. Is the interaction mediated by a single meson or by two quarks, and if the latter doesn't this violate quark...

Can somebody give me good reference and links for gene interaction.I am in dire need of it. Regards drdolittle

I have a problem in understanding the dependence by isospin of strong interaction. In this potential one have a lot of operatorial terms which include central, spin-spin, tensor force, spin-orbit terms, and all this four terms multiply by a factor isospin-dependent (tau_i dot tau_j). I don't...

Hi, i have a particle physics exam in 2 days and am confused on pion decay via the weak interaction, namely: pi[-] ->muon + anti-muno neutrino Thankyou Ray Veldkamp

We know "asymptotic freedom" says that the interaction between particles, such as quarks, becomes arbitrarily weak at ever shorter distances and stronger with range The quarks are connected like being on a rubber band: (string) I have the following questions: 1) While the quarks get...