What is Interaction: Definition and 711 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. N

    Minimum possible kinetic energy in an interaction

    Homework Statement Object A of mass 10 kg moving at 10 m/s [E] interacts with (but does not touch) Object B of mass 8 kg moving at 12 m/s [N]. What is the minimum possible kinetic energy of the system after the collision? Homework Equations M1V1o + M2V2o = M1V1f + M2V2f KE = (.5)(m)(v2)...
  2. S

    Energy transfer during photon interaction

    Let's consider a mach-zehnder apparatus The picture is below: http://en.wikipedia.org/wiki/File:Mach-zender-interferometer.png 1. When the photon encounters (and emerges from) a half-silvered mirror does it loose any energy? The photon does change phase when it moves through a half...
  3. J

    Heisenberg interaction Hamiltonian for square lattice

    Hi, I just started self studying solid state and I'm having trouble figuring out what the hamiltonian for a square lattice would be when considering the Heisenberg interaction. I reformulated the dot product into 1/2( Si+Si+δ+ +Si+δ+S-- ) + SizSi+δz and use Siz = S-ai+ai Si+ =...
  4. T

    Modeling Magnetic Dipole Interaction Between Permanent Magnets

    Two permanent magnets are on the table some distance apart and having some arbitrary orientation relative to each other. When we let go of them they will rotate and translate until they stick together. I am looking for suitable equations to model this interaction on a computer. Also, if anyone...
  5. M

    Is there any other software to visualise n-body interaction of charged particles

    Is there any other software to visualise n-body interaction of charged particles in real time by modelling both electric AND magnetic forces, like this: "Virtual Bubble Chamber" Electric and Magnetic Fields: Positron & Electron do the helix dance...
  6. S

    Can a Magnetometer Measure Current/Voltage Through Magnetic Field Interaction?

    Okay, I am not an electrical engineer but I dabble with circuits, electronics, and electromagnets. Id like to know if it is possible to measure the voltage, or current (not sure sure which is applicable here) using the measurement of interaction between one small magnetic field produced, and...
  7. J

    Symmetries and Spin orbit interaction

    I know that the generators of the Poncaire group that are associated with *orbital* angular momentum belong to an infinite dimensional representation, i.e. \begin{equation} L = \frac{\partial}{\partial \theta} \end{equation} Also the spin generators are associated with some finite...
  8. O

    QM: measurement vs interaction

    I'm just wondering... Regarding the single & double slit experiments... Why does every interpretation say that the photographic screen is 'measuring' the position of the particle traveling towards it? Why not say that the photographic screen interacts with an electron that is spread out...
  9. M

    Factors of interaction between atoms

    hello! I want to know which factors determine the strength of interactions between two atoms (which both or one or none can be a part of a bigger molecule) thanks
  10. N

    What is the charge of weak interaction?

    The strong interaction has color ''charge'',the electromagnetic interaction has electric charge,the gravity interaction has mass ''charge'',then what is the charge in weak interaction? Each interaction corresponds to a symmetry.Symmetry SU(3) for strong interaction, SU(2)xU(1) for...
  11. 1

    Molecular Orbital Theory: Explaining a "Dot" Representing No Interaction

    Question on Molecular Orbital Theory (and the "dot" that represents no interaction) I have a question about the "dot" that represents no interaction between orbitals. For example, in the molecular orbitals of H3, there is the lowest energy molecular orbital that has two bonding interactions...
  12. M

    How Does Coulomb's Law Apply to Non-Point Charged Particles?

    hello! which equation descripts the electrostatic interaction between two non-point (ie. that have dimensions) charged particles? thanks!
  13. ShayanJ

    Self Interaction: What, When, & How to Calculate

    I can't find sth about self interaction which tells for sure in what situations we should consider it and how to manipulate it! Can we talk about self interaction for e.g. a single electric charge?Or it appears only in certain cases?How should we calculate it? Thanks
  14. E

    How do photons cause matter to move?

    How does light cause matter to move? For example, when a photon collides with an atom, an electron absorbs the photon and moves to a higher energy state. If the energy is not used then the electron falls back to a lower energy state and emits radiation. I am unsure of how the photon in the above...
  15. T

    Can Coherent E and B Fields Produce Visible Light in a Box?

    Ok so I was wondering, let's say I have a device (eg., shaped like a toothpaste box with the two square ends cut off). I make 2 of the opposite faces from copper plate and the other 2 from iron plate (for example). I then generate an electric field in the box with the copper plates, and a...
  16. M

    What factors contribute to the strength of an atomic interaction or bond?

    hello! which factors determine, which parameters affect, the strength of an atomic interaction or bond? thanks!
  17. C

    Electron-Phonon interaction, is it like gravity?

    For my understanding of electron-phonon interaction is that when electron moves across a lattice, it distorts charges and it leads to a higher density of positive charge at an instance of a second. As the electron leaves the region of high positive charge, another electron will jump into...
  18. U

    Interaction between two point charges

    Let's suppose, we have two ideal point charges q_{1}, m_{1} and q_{2}, m_{2}. One of them comes from almost infinite distance with relative velocity v_{0}, w.r.t another charge. I'm curious how can we analyze this situation mathematically, i.e the equations of the motions of these particles...
  19. K

    Interaction between two material points

    Hi, there are two material points with unitary mass that can move on a stright line. They are subject to a potential of mutual interaction V which depends on x and y and it's not symmetric, where x and y are the coordinates of the two points. I can choose in the istant 0 v1,v2,x and y. How...
  20. J

    Penrose zigzag model of Higgs-electron interaction

    Roger Penrose in Chapter 25 of his book The Road to Reality describes a "zigzag" model of the electron that consists of a pair of massless components one with a left-handed spin (the zig) and the other with a right-handed spin (the zag). He says that the Dirac equation can be written as a pair...
  21. L

    Interaction Between the Higgs and the Graviton

    Recently, I was surfing Youtube looking for scientific videos, and I came across one on black holes. Naturally, I figured I'd already heard it all before, but decided i might as well watch it anyways. At one point, it talked about black holes making "dents" in space-time due to its its gigantic...
  22. S

    Is the wave function, an unreal tool, to partially model a real interaction?

    Is the wave function, an unreal (but a useful mathematical) tool, to partially model a real interaction? i.e. can probabilities have an existence of their own? i.e. exist by themselves without referring to some underlying phenomena? The wave function is a mathematical/probability tool. It is...
  23. F

    Understanding Nuclei Interactions: Strength of Strong and Weak Forces on Protons

    Both the strong and weak interactions are short range forces of approximately 1 fm. Two protons are separated by this distance. Which equation should i use for these two question? i) The strength of the electrical and gravitational interactions that influence each of these protons. ii)...
  24. A

    Density-density interaction in Luttinger liquids

    Hi, I'm reading ad article of Lal et al (junction of several weakly interaction quantum wires: a renormalization group study). It's quite cleare but there are some row I'm not good to understand. Could someone help me to understand how obtain equation (6) from equation (4)? I don't know how to...
  25. F

    Interaction across many-worlds

    I was reading a description of the many-worlds interpretation and it stated that the separate universes cannot interact with each other. But in the double slit experiment isn't the interference pattern that is seen when both slits are open, specifically caused by this interference? How can...
  26. A

    Coils, Current & EMF: Exploring the Interaction

    I guess it does not produce any field in 2nd coil because there's no change in current in coil right?So there won't be any emf .. but coil 2 has magnetic field passing through it which results in current in coil(by forcing movement of electrons of coil 2 SINCE ELECTRONS ARE ALREADY IN MOTION...
  27. W

    Spin-orbit interaction and bremsstrahlung

    Hi, It never occurred to me before, but when you derive the spin-orbit Hamiltonian as a perturbation to the hydrogen Hamiltonian, you imagine your electron orbiting around the nucleus, and of course that's not the correct picture because of the electromagnetic radiation that leaks out. So I...
  28. G

    Question about this interaction in QFT

    Question about this "interaction" in QFT Hi, I started two months ago my course in QFT, and since I heard about the fact that the bare mass appearing in the Lagrangian of a theory isn't the physical mass of a particle (due to self interaction, I guess), I tried to find an example explicitly...
  29. J

    Solar wind interaction with Earth's magnetic field

    I'm currently doing a project on how the solar wind interacts with the Earth's magnetic field, but I'm having a hard time grasping the concept of the plasma emitted by the Sun and how it shapes the Earth's magnetic field. I read somewhere about a simple mirror dipole approximation (I'm guessing...
  30. P

    Finding neutrino mean free path using cross section for interaction

    Homework Statement A supernova can produce a neutron star with typical radius 10km. Assume the neutron star matter consists of iron nuclei (A=56), produced by the electron capture reaction: e^{-}+Co\rightarrowFe+\nu_{e} The matter density is \rho=10^{5} tonne mm^{-3} and the neutrino...
  31. S

    How does an x-ray photon interact with ice?

    Well, I would like to know the interaction process of an x-ray photon with ice? Thanks in advance.
  32. C

    Medical Severe and disabling difficulties with social interaction

    First of all, I've already had and scheduled SEVERAL appointments with a psychiatrist, and I'm not asking for self-diagnosing advice - I'm simply wondering what I should look forward to after all the checking is done.So let me begin with a list of symptoms that I'm experiencing, or have...
  33. S

    Interaction of hot gas with electrons

    Lets say, we have a cathode that emits electrons into the space under field emission and create a space charge in air.There is no arching of electrons to anode.We have hot dense gas which blow on space charge in certain direction.What would be the most likely outcome of interaction between...
  34. A

    Metal Spheres; Interaction between conductors; induction

    Homework Statement Initially the three spheres are uncharged; then sphere A is dragged across a t.v. screen with an excess charge, giving (A) an excess negative charge. Then (A) is placed next to (B) and all three spheres lie on a line. There is a wire connecting (B) and (C). We want to...
  35. N

    2 questions on symmetries: conserved in interaction => eigenstate in interaction ?

    2 questions on symmetries: "conserved in interaction => eigenstate in interaction"? Hello, I'm currently taking an introductory course in elementary particles (level: Griffiths) and I have 2 questions that are severely bothering me; all help is appreciated! They are related to Griffiths'...
  36. J

    Van der Waals Interaction

    I need to report about the Van der Waals interaction in our Quantum Mechanics class. Can someone please help me sort things out about Van der Waals interaction? How do go think should I go about it? In our book, the only thing discussed is the Van der Waals interaction between two hydrogen atom...
  37. D

    How analogous is the strong force to photon/electron interaction in QED?

    ; Can someone explain to me (in layman's terms,) how it might be possible to associate the interactions of the up/down quarks in the strong nuclear force as analogous to the way electrons and photons interact in quantum electrodynamics ?
  38. N

    Semiclassical descriptions of atom-light interaction

    Hi Say I want to describe the interaction between a free atom atom and a classical EM field. The full Hamiltonian for the problem must be H = (H_0 + p^2/2m) + (H_V + H_E) + H_D where H0 denotes the internal levels of the atom, HV the vacuum field, HE the energy density of the classical...
  39. W

    Determining a mediating force of an Interaction

    What kind of force mediates the reaction: K- + alpha(ppnn) -> pi- + "hypernucleus"(ppn lambda) s(u) + (uud + uud + udd + udd) -> d(u) + (uud + uud + udd + uds) (u) is anti u We need to explain which force mediates this reaction. I am pretty sure it does not involve the weak force...
  40. harrylin

    Photon interaction during refraction

    This is a follow-up of the following thread on refraction: https://www.physicsforums.com/showthread.php?t=576212&highlight=photon In a nutshell, an optical photon that traverses a solid dielectric extends over many atoms. While the photon traverses the dielectric, it continuously transmits...
  41. B

    How can I find electrostatic interaction force

    There is given two neutral parallel plates, distance between them is d. Between them is putted insulating plate with a thikness of d. After that one of two plates was charged positively. How can I find electrostatic interaction force?
  42. P

    Neutrinos Interaction with EH of Black Holes

    Hi all, While the articles I have been reading are about a year old (which can be considered relatively outdated in terms of particle physics) I have been looking at the possibility of Neutrinos being able to travel at FTL (Experiments conducted by CERN and OPERA). I understand in the articles...
  43. N

    The dipole interaction and fermions

    Hi When looking at the interaction between an EM-wave/field E with an isolated atom, we know that they interact via the time-dependent dipole interaction V = dE. This can be derived by looking at an electron bound to an atom, and it is used in systems, where the atom can be rightfully...
  44. X

    What is the difference between interaction and measurement?

    Hello, as far I understand wavefunction collapse (or decoherence or whatever stops particles from acting as waves) is initiated through something referred to as a measurement. These measurements are thought of as interactions. Now the question I have is, why are some interactions measurements...
  45. binbagsss

    Stars, fusion, how exactly the weak interaction acts ?

    I am currently reading E=Mc^2 and have a quick question regarding some of the nuclear fusion they describe that takes place in stars: When proton fusion occurs, one of the protons decays into a neutron + positron + neutrino – due to the weak interaction. And the proton and neutron , acted...
  46. N

    Why CP symmetry is violated in weak interaction?

    Please teach me this: Why is CP symmetry violated in electro-weak interaction? Is it correct that because of the mass of neutrino is zero(so that the left and righ neutrinos do not mix with each other)? Thank you very much in advance.
  47. Q

    Exploring Sub-Atomic Interactions: The Role of Critical Boson Exchange Rates

    According to the mathematics of sub-atomic particles, unless your force parameters on them, their wave function extends indefinitely through space, so why is it that interactions only happen at certain distances? Is there some kind of critical boson exchange rate?
  48. O

    SSSI (structure-soil-structure interaction)

    Hi all, I am doing a masters in SSSI and I am a mechanical engineer so a lot of this stuff is all new to me (manly civil engineering based masters) so I have a question for the pros. (I will also do some analysis on SSI (soil-structure interaction) What is a good software to use to analyse...
  49. X

    Work interaction, power integral calculation

    Homework Statement A person weighing 800 lbf climbs a flight of stairs that extends a vertical distance of 300ft. Calculate the work and power required for this process if it requires 3 min, 5 min, and 10 min. Homework Equations W=integral(Fds) Power=FV The Attempt at a Solution...
  50. X

    Thermodynamics, work interaction, pressure, power

    Homework Statement Denver's Mile High football stadium incorporates a system by which a section of stands can be moved to accommodate different sports on the field. The grandstand, which has a mass of 4x10^6 kg, can be moved a distance of 45 m on a thin film of water. The movable grandstand...
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