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. D

    Finding Range of Weak Interaction from Mass of Z Boson

    Homework Statement One of the mediators of the weak interactions is the Z boson, which has a mass of 91 GeV/c 2. Use this information to find an approximate value for the range of the weak interaction. Homework Equations This is the part that I am having trouble with. I don't know where to...
  2. G

    Why is there no constant magnetic dipole-dipole interaction?

    In my opinion, there should be a magnetic-dipole-dipole interaction between 2 1s-hydrogen atoms, but i could not find anything that confirms this. first of all i discovered this equation here: http://en.wikipedia.org/wiki/Magnetic_dipole%E2%80%93dipole_interaction the potential energy U = -...
  3. P

    Interaction of light with matter

    I'm not sure what is the correct interaction hamiltonian between an electron in an atom and electromagnetic wave (described classically). According to me there exist two version of this hamiltonian which differ by factor 2: H_{int} = \vec{E_0} \vec{r} \cos(\omega t) or H_{int} =...
  4. B

    Explaining the Interaction of a Time-Dependent Force and an Oscillator

    Homework Statement A harmonic oscillator starts in its ground state (n=0) at t=-infinity. A perturbation H = -xF(t) is applied between t= -infinity and t = T. (a) by considering the corresponding classical interaction explain why this represents the application of a time dependent force...
  5. E

    Exploring Strong Force Interaction in 2s/2as Tetraquark Decay

    I'm working on a problem involving decay of a 2 strange/2 anti-strange tetraquark particle. 4 sample decay diagrams are given and I am to describe them and choose which is most prevalent. In on diagram, two of the strange/anti-strange quarks become two down/anti-down quarks via gluon through...
  6. R

    Exploring the Interaction of Fermions and Bosons

    Just wondering... If the interactions between fermions are the emittance of a boson (from what I understand from the grand design book by stephen hawking) then when you punch someone, is it just high levels of bosons being emmited and clashing or are the actual boson particles colliding?
  7. P

    Entropy of interaction in the nuclei

    It's hard to me to understand about the interaction between protons and neutrons by the means of entropy. And Is it possible to know about an entropy of an interaction between protons and neutrons or between quarks:biggrin:?
  8. M

    Radiation Interactions: Analyzing Dominant Processes in Gamma Ray Interactions

    Homework Statement state which one is dominant in Photoelectric effect, compton scattering, pair production, 1- Gamm rays in AL with 1MeV 2- Gamma rays in H with 100keV 3- Gamma rays in Iron with 100KeV 4- Gama rays in C with 10MeV 5- Gamma rays in Lead with 10MeV Homework...
  9. S

    Can High Energy Gamma Rays Interact with Protium and Heat It Up?

    Hi All, How can a high energy (above 1 MeV) gamma ray interact with a protium (hydrogen with only a proton in nucleus)? Does it only ionize it? Does it break it up? Does a chain reaction occur where antiparticles are formed and then annihilated, spitting out another gamma ray? I've been...
  10. N

    Why point particle interaction has UV divergence,but string interaction does not?

    Please teach me this: Why point particle interaction(QTF theory) has UV divergences,but string interaction does not have UV divergences.Because I think that calculating the probability amplitude of a process,we must sum(or integrate) over all possible value of momentum.So how we avoid the UV...
  11. A

    Interaction energy and gauge invariance

    Hi everybody, i have a question concerning potential energy (in all its forms, which basically means all forms of energy except the kinetic one). The kinetic energy of a system is always well defined: in the rest frame it is m² (convention c=1), in a frame moving at a relative speed v compared...
  12. F

    Hydrodynamic interaction of particles

    Homework Statement The flow of a single sphere translating at speed U in a fluid at rest far away from the sphere is given by the streamfunction, ψ(r,Θ) = (1/4)Ua2(3r/a - a/r)sin2Θ a=radius of sphere the origin is at the centre of the sphere and the axis Θ = 0 is...
  13. C

    Cavitation bubbles interaction

    - Lest say that we have a homogeneous liquid that is vibrated at a certain frequency so we get cavitation bubbles inside the liquid. Let's say that the cavitations lifetime is long enough to play with them. - Could we manipulate these cavitation bubbles so we can move them around and...
  14. M

    Exchange Interaction - Helium

    Looking thru some notes one this, I came across something which I can't get my head around. The Hamiltonian of the system (Helium atom) is H = H_1 + H_2 + W, the energies (kinetic and electron-nucleus) of electron 1, electron 2 and the interaction between the electrons themselves. To find...
  15. D

    Why is the exchange interaction isotropic in a simple system of 2 electrons?

    Considered a simple system composed by 2 electrons, like the H2 molecule, the exchange interaction is isotropic: there's no preferential direction of the spins in physical space. What is the reason? Maybe the fact that the exchange interaction deals with only with the Pauli exclusion prinicple...
  16. S

    What Is the Minimum Energy Required for e + p -> Neutrino + Neutron?

    Homework Statement Im being asked what is the minimum energy requiered for the process e + p -> nutrino + nutron assumptions are: 1. Kinetic energy of proton is much lower from his rest mass, not true for the electron. 2. border line case is when nutrino energy is close to zero...
  17. Simfish

    Chances of catastrophic interaction with rogue planet in Sun's lifetime?

    Well, it seems that the chances of a catastrophic interaction with another star (dead or alive) is very minimal. We also know that the chances of this interaction are still minimal once the Milky Way will collide with the Andromeda galaxy (this may increase the total number of stars by a factor...
  18. soothsayer

    Energy splitting from spin-orbit interaction.

    Homework Statement The spin-orbit interaction splits the hydrogen 4f state into many (a) Identify these states and rank them in order of increasing energy. (b) If a weak external magnetic field were now introduced (weak enough that it does not disturb the spin-orbit coupling), into how many...
  19. K

    Some confusions about interaction picture, in peskin

    In peskin chap 4 on interaction field theory, he first introduced some basics about interaction picture(mostly in pg. 83~87) , it seems he assumed the Hamiltonians H=H_0+H_int in Schrodinger picture are all time-independent, because he used quite a lot of notations like exp(iHt), exp(iH_0t) and...
  20. D

    How to Solve for Variables Using Derivatives in Atomic Interactions?

    Suppose that the interaction energy between two atoms is given by: E(R)=-A/(R^2)+B/(R^10) The atoms form a stable molecule with an inter- nuclear distance of 0.3nm and a dissociation energy of 4 eV. a) Determine A and B. b) Calculate the force required to break the molecule. What is the...
  21. D

    Spin-Spin interaction question

    According to wikipedia http://en.wikipedia.org/wiki/Diproton "Diprotons are not stable; this is due to spin-spin interactions in the nuclear force, and the Pauli exclusion principle, which forces the two protons to have anti-aligned spins and gives the diproton a negative binding energy."...
  22. C

    What is the angle between a disc and a vertical surface?

    Hello all, i wonder if you can help me with a problem I am having. I have a disc and three planes (representing a road, building and roof). For this problem, the disc can be considered a plane. http://i3.photobucket.com/albums/y60/con20or/Fig1.png I know the orientation of each of the...
  23. A

    Energy Interaction: Work Transfer in a Heated Oven

    - We know that for closed systems, energy transfer between the system and the environment can be in the form of heat or work. -We know that for open systems or control volumes, energy transfer between the system and the environment can in the form of heat, work, or mass flow. Let's say we have...
  24. M

    Where does the energy of a destroyed W boson go?

    Hello. I'm new so I am uncertain to which forum this post should be posted in so I'll just leave this here. Anyways, I was reading about the four fundamental forces and it came to my mind that the W boson is 80.4 GeV, whilst the two lepton that are excreted upon destruction are 0.511 MeV...
  25. S

    Why do babies need social interaction?

    An experiment performed by a German king in the 13th century made me think. He put several babies into a cell with no social interaction but to feed them. They all died with no apparent reason. My question is, why was that? How can the body simply shut down if no social interaction is attained?
  26. A

    Is Dark Matter Only Present on a Galactic Scale?

    Why doesn't dark matter affect the movement of solar system bodies as it does with the galaxies and stars movement?. Is it possible that dark matter affects only at galaxies scales or that the heliosphere interferes with the interaction of dark matter at solar systems scales (I say this because...
  27. T

    Yukawa [3 Dirac - 8 scalar] interaction lagrangian

    Homework Statement Given an interaction lagrangian L = i \, g \, \bar \psi(x)_i (\lambda^a)_{ij} \gamma_5 \, \psi(x)_j \phi(x)_a where \psi_i are three Dirac fermions with mass M and \phi_a are eight real scalar fields of mass m and \lambda_a are the generators of SU(3). I have to find...
  28. Demon117

    Coulombic interaction between the proton and electron of a hydrogen atom

    In the position representation, its true that we can use operators to represent the coulombic interaction between the proton and electron of a Hydrogen atom. I've never actually given any thought as to what the elements of such an operator would be (in matrix form of course). I know these...
  29. R

    Feynman diagram for weak interaction.

    For a leptonic weak interaction diagram, we have an election converted into a neutino and emitting a w- particle. But only left handed part should undergo weak interaction. So basically you should have the left handed part of electron converted into a neutrino(left handed) emitting a w-...
  30. Spinnor

    Two complex fields + interaction, conserved current?

    Say we have two complex fields, f_1 and f_2 which each are solutions of the D'Alembert operator or the wave operator in three space dimensions. Say we subtract the square of the magnitude of the difference of f_1 and f_2 from the Lagrangian for the fields f_1 and f_2. In that case the Lagrangian...
  31. J

    Does the strength of the strong interaction depend on the colour of the quarks?

    My understanding of colour so far is that if we had, say, a baryon with quark content uuu, we would need to invoke a new quantum number that would allow each quark not to be in the same quantum state to avoid violating the Pauli principle. Now apparently this new quantum number is called colour...
  32. D

    Courses Computer Science course (Hardware/Software interaction)

    What is a CS course that covers how software and hardware are connected? This probably seems simple to most but I have no clue as to how this interaction works. A lot of the courses I've looked up seem to be either hardware or software only. Also, is there a name for this area of CS so I can...
  33. K

    Exploring Weak Interactions: Gravitational, Electrodynamics, Nuclear, and Quarks

    Gravitational force between masses is given by the law of universal gravitation. Electrodynamics force between electric charges is the Lorentz force. Nuclear force between nucleons falls off exponentially with rising the distance. The force between quarks grows in proportion to the distance. Can...
  34. H

    Moving charge in a magnetic field, magnetic-magnetic interaction?

    When a charged particle moves through a magnetic field, the field excerts a force in the normal-direction (90 degrees).. Is this caused by magnetic-magnetic interaction? I.e. a charged moving particle sets ut a circular magnetic field, is it this field which interacts with the magnetic...
  35. M

    Interaction force, two dipoles

    Homework Statement A dipole p is directed in the positive z direction at the origin. The force on a dipole p in an electric field E is F=(p\cdot\nabla)E If a second dipole is placed at (r, \theta), by what factor must r increase – in terms of p, \theta and r – so that the net force between...
  36. R

    Semiclassical Atom-field interaction

    In the semi-classical treatment of light-Atom interaction, light is treated as an electromagnetic wave while atom is thought of as a quantized harmonic oscillator with discrete energy eigenfunctions, the atom can absorb energy from the incident wave and become excited under certain conditions...
  37. B

    Hot water / cold steam interaction

    Hello, I came to consider the following problem, and cannot seem to find the right way to tackle it. It is not homework, merely a question I'd like to address out of personal curiosity: Consider two volumes V1 and V2, each assumed adiabatic, and linked with a valve. V1 is considered...
  38. S

    Weak Electron Interaction: Virtual Photon Effects?

    hi, let's suppose 2 electrons are far away each other and therefore they interact very weakly. i wonder if in such case there are as many virtual photons in the case they are very close to each other? because i know that only 1 electron in complete vacuum generates an electromagnetic field and...
  39. I

    Pan proto experientialism and the quantum exchange interaction

    pan proto experientialism and the quantum exchange interaction. Would the quantum exchange interaction explain how (proto)experiences among particles are intimately shared to form what we perceive as an experience?
  40. A

    Configuration Interaction

    I am trying to calculate the excionic and biexcitonic energies in quantum dots using Configuration interaction method. I tried to calculate the two electron integrals for configuration interaction method. The integrals are of the form: \int\int dr_1 dr_2 \Psi_1(r_1)...
  41. V

    Photon Interaction: A Comprehensive Guide

    I have read so much, please put me straight on "photon interaction" 1. My photon hits matter. 2. It interacts with the atoms of that matter. 3. The electron (say) energy level transition (High->Low) spawns photon(s) of lower energy levels? 4. My photon is now other photon(s) but...
  42. K

    How Do Magnetic Dipole Moments Interact at a Distance?

    Say you have two magnetic dipole moments, say p1 and p2, which are separated by a distance r, with no external magnetic fields. If you want to figure out the energy of their magnetic interaction, is it valid to figure out the energy of p1 in the magnetic field generated by p2, or vice versa...
  43. D

    Photon interaction cross section? What?

    Photon interaction cross section? What?!? Hey guys-- I'm practicing for the GRE, and I came across a question that has stuff that's not even in my textbook! I haven't found much from googling either. Here is the question: My instinct was to guess (C) because graphs I had seen of the...
  44. P

    Interaction of a phonon with evanescent wave

    When exciting a phonon mode with an evanescent wave possessing a wavevector ~100-200X larger than freespace but still ~10X smaller than fermi wavevector, would one expect a different resonance frequency for the phonon mode? I would think not.. but experiment seems to say yes. More specifically...
  45. I

    Fock space in interaction theory

    Does anyone know how to construct Fock space in an interacting theory? I am confused by the concept of Fock space in interacting theories, please tell me where is wrong in my following argument: Consider an interacting theory of non-derivative interaction, say, a simple \phi^4 theory...
  46. S

    Statistical mechanics & the interaction energy

    hi everyone! I am so confused about interaction energy! as you know, in many statistical mechanics books we see there are equations which are taken in a non-interacting system. for example for a two particle system, you can see the total energy is: E = E1 +E2 +E12 while E12 is the...
  47. F

    Investigating Neutrino Interaction with Electron with Pythia

    Hi, I'm Chen. Recently I was trying to study the neutrino interaction with electron. Question: can Pythia generate the event of ( e , neutrino ->...) ? if so, please help me for input program. thanks Chen
  48. L

    Can Magnetic Fields Interact and Be Reduced to Scalar Potentials?

    The total electric field is the vector sum of electric fields- is this the case with magnetic fields? Experience tells me a vector magnetic field can alter another vector magnetic field- for example, when you push two magnets together.
  49. L

    Hydrophobic interaction with water

    Homework Statement So like let's say oil and water are interacting together. I know that they do not readily interact together and so water aggregates in a more ordered state around the oil. But then this is where I'm confused; -They say that the delta G (change in free energy) is...
  50. D

    Magnectic field and electrical interaction

    simple question from a beginner to physics, in wikipedia it states that a magnetic field can be detected by its affects on a moving electrical charge, but does "not" go onto say how an electrical charge is affected by magnetic fields, is the current weakened/distorted or am i swinging in the...
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