What is Interactions: Definition and 290 Discussions

Interaction is a kind of action that occurs as two or more objects have an effect upon one another. The idea of a two-way effect is essential in the concept of interaction, as opposed to a one-way causal effect. Closely related terms are interactivity and interconnectivity, of which the latter deals with the interactions of interactions within systems: combinations of many simple interactions can lead to surprising emergent phenomena. Interaction has different tailored meanings in various sciences.

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  1. J

    Magnetic interactions of atom

    as far as i know it takes certain amount of energy for an electron to change orbit now what i am wondering is why the energy required for an electron to change orbit doesn't change when close to let's say another positively(or)negatively charged atom thank you for your time and sorry for the...
  2. L

    Virtual particles in interactions

    Hi, so we have just started doing some physics of fundamental particles etc at school. i am reading a lot about the exchange of 'virtual' photons etc. i am confused about whether these particles actually exist in a physical sense or whether they just have to be there to conserve...
  3. E

    In electron/photon interactions does the handedness of the photon matter?

    In an interaction between a free electron and a photon does the handedness of the photon matter? For example, does an electron interact more strongly with a left-handed photon or with a right-handed photon (assuming both photons have the same frequency)? Does the electron spin (left- or...
  4. N

    Exploring Atom-Laser Interactions: Understanding the Role of Photons

    Hi I have two questions regarding atom-light interaction. 1) Usually when we look at e.g. slowing atoms by a laser beam, we model the atom as a classical particle, i.e. we deal with a force F and not an operator. I was wondering why we are allowed to do that. Is it because the atom is small...
  5. L

    Calculating Charge Interactions: Half-Speed & Beyond

    Homework Statement A fixed charge Q= +3.65 µC is held fixed at the origin of an xy plane. A second charge q= +5.11 µC is released from rest at the xy coordinate of (+1.15 m, +0.810 m). a) (a) If the mass of q is 2.90 g, what is its speed when it moves infinitely far from the origin...
  6. R

    Can photon-photon interactions alone produce black body radiation?

    Suppose you have a container with perfectly reflecting walls, containing electromagnetic radiation that is not in equilibrium (i.e. does not have a Planck distribution of energies.) Will photon-photon interactions (QED and/or gravitational) produce a Planckian distribution after a sufficiently...
  7. B

    Derive an expression for the rate of interactions in a fixed target experiment

    Homework Statement Derive an expression for the rate of interactions in a fixed target experiment, for which the beam of incoming protons has a current I, the target density is ρ(g/cm^{3}), the target thickness is d and the interaction cross-section is σ. You assume that the beam particles...
  8. J

    Explaining role of Pions in Strong force interactions.

    Let me start off by saying that I am no professor of any kind, i am simply a high school student in way over his head concerning particle interactions. Without a class to teach me, i have used the magic of the internet to attempt to get a rudimentary understanding of these interactions. I...
  9. S

    Gravitational Interactions » Truck and Car

    Homework Statement i need help with this problem (Online HW) If the force of attraction between a 1035 kg sports car and a 10680 kg cement truck is 3.930×10-6 N, how far are they apart? Homework Equations F = Gm_1m_2/r^2 The Attempt at a Solution
  10. P

    Atomic Attraction: Examining Electrical Interactions

    If it is electrical, why is there attraction between atoms? Shouldn't they repel each other due to outer electrons?
  11. P

    Java Problem with Interactions Pane (DrJava) in Eclipse

    When I start DrJava in Eclipse the Interactions Pane gives me this: "Could not creat the view: Wait for interpreter to register was interrupted (probably timed out): java.lang.InterruptedException" What does this mean and what do I do to fix it? Thanks
  12. G

    Exploring Excited State: Spin and Photon Interactions

    hi i have a question about excited state: let me say you have an atom and then you use light to get the electron to a higher energy level. does this mean, that there is always a spin change, cause as far as i know the spin of a photon is 1. but what happens if you have an electron...
  13. C

    Polarizability of Fixed Dipole Interactions

    Hi all, I've been having a problem with understanding some of the van der Waals forces. I understand that the polarizability of a induced-fixed dipole interation is: \begin{equation}\alpha =4\pi\epsilon r^{3} \end{equation} Which leads to the potential field (assuming two different...
  14. C

    Electron interactions in a Helium ion

    Homework Statement The question was, you have a Helium ion with one electron in its ground state. Then a second electron is added to the n = 10 level. What effect does the second electron have the first electron that is nearest the nucleus? Is the energy increased or decreased? Homework...
  15. N

    Do speeds of propagating of all interactions have the same value c?

    Please teach me whether this is correct: It seem to me that the velocity of propagating of all type of interaction is the same value c as the velocity of light.Because equation of propagating of phase p.x=0 leads to v=E/p^(where p^-modul of spacelike-momentum)=square(c)/v then v=c.Where p is...
  16. S

    Weak interactions that change lepton flavor

    Are there any W^\pm or Z^0 interactions that change lepton flavor? For example, turn an electron into a muon or vice versa? Thanks!
  17. C

    Can You Explain The Interactions Of SUSY?

    Im having a little bit of trouble with SuperSymmerty. I understand all the basics with the sparticles and gauginos being -1/2 less and how their properties change to boson-like and fermion-like respectively. What i don't understand is how do the interact exactly. i know none have been found in...
  18. S

    Are all transfer in energy a result of Boson interactions?

    Sorry if I posted this in the wrong forum, to me it looks like this forum is for high energy, nuclear, OR particle physics. I was wondering if anybody could help me with this. I was trying to ask my teacher about the nature of energy transfer, and she said something that I really believe is...
  19. L

    Calculating Centre of Mass Energy in Fixed Target Interactions with the LHC

    Homework Statement The proposed maximum colliding beam energy, Ec, in the Large Hadron Collider is 7TeV per beam (proton-proton collisions). By a Lorenz transformation, show clearly that to produce the same centre of mass energy in a 'fixed target' interaction, the beam energy woulr have to...
  20. N

    Navigating Social Interactions as an INTJ Engineering Major

    I have heard that social skills are very important. (I'm an engineering major.) What kind of social skills, specifically, are important? I have no problem carrying a conversation with an intelligent person about either a common interest we share or about an idea. This ranges from...
  21. D

    How can particles undergo EM interactions *and* have definite strong isospin?

    I am deeply confused about the following and I'd really appreciate it if anyone could help! Consider a charged hadron such as a proton. Amongst the state-independent properties that define a proton are strong isospin Iz=1/2 and charge Q=e. Now, the total Hamiltonian for a proton is Hs...
  22. F

    1st to 2nd quantization, potential approximates interactions?

    I'm wondering if the potential term in the Lagrangian for a single particle is just an approximate way to summarize all the interactions of virtual particles created by the potential at every point. For example, the EM field is mediated by photons at every point in space. In reality an electron...
  23. Simfish

    Exploring Long-Range Coulomb Interactions in Space

    I'm just curious, as space offers the huge length scales that could substantially lengthen the attractive interaction between positive and negative charges (although charges will still be repelled from other like charges)
  24. G

    Light frequency/electron interactions

    Is there any science out there that associates electrons with having different frequencies of their own (like light has different frequencies) depending on where they are in which atom? I'm just wondering why electrons have particular quantum jump differences between the different types of...
  25. A

    Interactions between virtual and real particles

    Hi all, I have (what might be a rather odd) question about the interactions between real and virtual particles. Let's say we have an isolated proton, moving slowly through space. There will be virtual proton/anti-proton pairs popping in and out of existence in the surrounding space. On...
  26. W

    Electromagnetic interactions & photon transfer

    Hello. One confusion regarding the explanation of electromagnetic [EM] interactions through photons. Conisder the water jug example given in this wikipedia http://en.wikipedia.org/wiki/Fundamental_interaction#Electromagnetism". It says - "if we place two such jugs a meter apart, the...
  27. R

    Strong and weak interactions in nuclear physics

    Homework Statement How do we determine whether we have a strong or a weak interaction? (for the following processes) For example we have a reaction K^{-}+p\Rightarrow \Xi^{-}+K^{+} or another example K^{+}\Rightarrow \pi^{+}+\pi^{0} thanks!
  28. P

    Confusion regarding interactions and its relation to the strong/weak force

    I'm not using the template because, again, it's not a question I need help with, it's understanding the topic so I can actually do the homework. :P First of all, is interaction completely different to decay? Because all hadrons interact by the strong interaction, and yet they can decay into...
  29. B

    Neutral Current and charged current(weak interactions)

    My question is how to compute the ratio of cross section (mediate by charge current) of neutrino/ anti neutrino of electron in a nuclei which is made of an equal number of proton's and neutrons The same question to neutral current. I have to deliver soon my work. I hope you can answer...
  30. E

    Running coupling of the weak interactions

    Can someone point me to a reference that explains how the (effective) running coupling behaves in the weak interactions(at 1-loop order). I couldn't find it... If I understand correctly, than the coupling is g = \frac{e}{sin(\theta_W)} where e is the QED coupling, which increases with energy...
  31. J

    Some questions about particles being produced in certain interactions

    Hi, I keep reading about particles being produced in certain interactions, but I'm not completely clear on what this means. The image I have in my head is this. Say two protons collide with each other and move off with less energy than they started with, and the energy deficit goes into creating...
  32. R

    Relationship between mass and interactions

    hi, it is a known fact that quarks are the most massive particles, and they interact with the 4 forces. then electrons, muons, and tauons are less massive, and interact with 3 forces. finally neutrinos are even less massive and interact with only 2 forces. I wonder if there is any...
  33. R

    Degeneracy pressure and interactions

    hi, I wonder if the electromagnetic force is the force that expresses how pressure interacts. I mean, a pressure is a force divided by a surface. is that force the electromagnetic force, that would be the consequence of an increased kinetic energy?
  34. M

    Jellium Model: Finite Confinement & Coulomb Interactions

    Is the Jellium model only suitable for an electron gas of infinite volume? If I confined a gas to a finite volume using an infinite potential well, is there still a way to cancel out the infinities in the coulomb interactions between electrons?
  35. L

    What are Van der Waals interactions?

    Homework Statement So basically I'm sort of unclear as to what van der walls interactions are and how they occur...like I know that they're a type of noncovalent bond that occurs between identical groups in two molecules. Like, how do the partial charges appear? (e.g. let's say there are 2...
  36. B

    How to study EM wave interactions via internet?

    I would like to do some reading about how EM waves interact with each other via internet. Upon googling "EM wave interaction," I got some general links about EM radiation and some book titles but I didn't see any websites. Does anyone know one or more good online sources that give an overview...
  37. A

    Ising model and more complex interactions between particles

    Hello, First of all, sorry if my question is trivial but I'm not a physicist ;-) I heard a lot about the Ising model used to compute the energy of a system with 2 states. This model seems to be a bit "simple" because it assumes that particles interact with their nearest neighbors only. I was...
  38. T

    Does gravity play a role in particle interactions?

    I know that particles don't have much mass and that the "force" of gravity is weaker than elecromagneitic or nuclear force, but gravity isn't really a force, it's a warping of space time related to energy density. Particles are quite dense so they should significantly warp space on a small...
  39. K

    Electroweak Interaction: Theory & Symmetry

    I understand that the Colour Force is described by Quantum Chromodynamics, Electromagnetism is described by Quantum Electrodynamics and Gravity will hopefully be described by a Quantum Gravity Theory but currently General Relativity. But what Theory describes the Electroweak Interaction? Is...
  40. V

    Mediators and propagators of particle interactions

    hello I'm studying nuclear physics and I have a lot of questions which I can't figure out. The first thing has been thrown in my mind by a colleague of mine about propagators of particle interactions. It has been said that, for example, photons are the mediators for the electromagnetic...
  41. M

    Solving Spin 1/2 Interactions with Hilbert Space Dimensions and J$^2$

    Homework Statement three distiguishable spin 1/2 particles interact via H = \lamda ( S_1 \cdot S_2 + S_2 \cdot S_3 + S_3 \cdot S_1 ) a) What is the demension of the hilbert space? b) Express H in terms of J^2 where J = S_1 + S_2 + S_3 c) I then need to find the energy and...
  42. D

    Perfectly Rough Contact: Exploring Surface Interactions

    What does it mean for the contact between two surfaces to be "perfectly rough"?
  43. O

    Interactions between polar materials and magnetic field

    "interactions between polar materials and electric field" sorry typing error.polar materials are those who have a permanent dipole ( like water molecules ) but these dipoles doesn't appear on the macroscopic scale due to their random orientation , so what if this polar medium is subjected to...
  44. C

    Calculating Magnetic Interactions in Parallel Wires

    Homework Statement Shown at right is a cross-sectional view of two long straight wires that are parallel to one another. One wire carries a current out of the page; the other carries an equal current into the page. I don't know how to show the diagrams, but the current into the page is at...
  45. Q

    Atomic Interactions with External EM Fields

    I did not quite understand the "stimulation" part. How does the photon coming near the excited atom force this atom to emit another, identical (from the physical properties point of view) photon? More precisely, how do the stimulating photon and the atom interact?
  46. A

    Interactions between real and virtual particles?

    Hi folks, I have a question about virtual particles, and so far I haven't been able to find an answer. Do virtual particles ever annihilate with real particles? (Black hole evaporation aside) For example, let's say we have a (real) electron, floating in space, and a virtual...
  47. K

    Energy and computational complexity of atomic interactions

    Hi Recently I've been pondering the causes of enormous difference in energy requirements between modeling a complex process like fluid dynamics on computer and the actual energy required in the physical fluid. In a computer, it takes hundreds or thousands of processors long periods of time to...
  48. Astronuc

    What Caused the Ejection of Mu Columbae and AE Aurigae from Orion?

    I was listening to the regional NPR station yesterday and hear a brief discussion of two binary systems. http://stardate.org/radio/program.php?f=detail&id=2009-12-26 Is this common? Is it plausible? I presume that some how the velocity of Mu Columbae and the other star traveling 'north'...
  49. V

    Is the coupling constant just Gz for all these interactions?

    Homework Statement Just a quick question, the Z can couple to leptons and there antiLeptons and quarks and there corresponding antiquark. Is the coupling constant just Gz for all these interactions? Or is it Gz.Sin(z) for some and not for others? Iv seen different notation and am wondering...
  50. K

    Particle Physics Struggles: Which Interactions are Most Likely?

    I'm struggling a bit with my module on particle physics. This is only part of the problem set, but I need it for the rest (which is asking whether or not some particular decays are possible). My problem is: How can you tell which is the most likely interaction for certain processes? For...
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