Modes Definition and 243 Threads

  1. S

    Guess Decay Modes: A, Z, Mass Diff MeV

    how can we guess the possible decay modes for an element with three given quantities: A, Z and mass difference in MeV
  2. G

    Structural Vibrations Analysis & Simulation

    Recently I created a structural vibrations simulation and would like to hear some feedback or suggestions.
  3. Spinnor

    Casimir effect excludes photon modes*, same for two slit interferometer?

    Can we say that a point light source (turned off) together with a two slit interferometer and say a photographic plate detector exclude certain photon modes? Light does not go to certain parts of the photographic plate so can we say that the source (turned off), the interferometer, and the...
  4. PhysicsKid0123

    Why are normal modes important when analyzing waves or oscillations?

    Why are they important? I've been learning about them quite a bit and have no idea why they are significant. What is the motivation for their discovery, their use, or even their mention in physics for that matter. All I really know is that when you look/have solutions with the same angular...
  5. Z

    What is the lower limit of frequency range of acoustic phonon modes?

    Good day everyone. I would like to know about the lower limit of the frequency range of active acoustic phonon modes. Textbooks say it can reach zero. But I am curious about whether it can be very small, such as 1 micro volt or the like. Would a phonon mode of so small energy be of any...
  6. W

    Degeneracies in Optical Modes in relation to Heat Capacity in a Solid

    Technically I'm supposed to have a total of 8 optical modes but only 4 of them were seen in a solid (by spectroscopy). So I suspect there's some degeneracies and symmetries involved, but I don't know which ones. I have two sets of assigned degeneracies: frequency; degeneracy set 1; degeneracy...
  7. sergiokapone

    Harmonic oscillations of the electromechanical system (normal modes)

    Homework Statement http://imagizer.imageshack.us/v2/275x215q90/661/kIVMcC.png Mathematical pendulum is the part of the oscillating circuit. The system is in a constant uniform magnetic field. Oscillations is small. Find the normal modes of oscilations. Homework Equations ## \begin{cases}...
  8. W

    Relating molecules, atoms to number of optical branches (modes)

    I'm stumped as to how many optic branches (modes) are present if there are X number of molecules in a unit cell and Y number of atoms in each molecule. I know that each individual atom has 3 degrees of freedom and more generally in a single unit cell, there are 3 acoustic branches (modes) and...
  9. D

    Normal modes of electromagnetic field

    Hey guys, I'm trying to understand the properties of normal modes of the electromagnetic field inside an arbitrary cavity, but I'm having some trouble. By definition, for a normal mode we have \mathbf{E}(\mathbf{x},t) = \mathbf{E}_0 (\mathbf{x}) e^{i \omega_1 t} and \mathbf{B}(\mathbf{x},t) =...
  10. J

    Frequency for Vibration Modes of a Square Membrane

    So the equation to obtain the frequency of the modes of a square membrane is something like ω m,n = ∏ [(m/a)^2 + (n/b)^2]^(1/2) This equation can be used to get the frequency for Modes such as (2,1) and (1,2). How do I get the frequency for such modes as (2,1)+(1,2) and (2,1)-(1,2) ...
  11. R

    Modes - physical meaning and use

    Modes is usually encountered in physics when we study wave propagation of any sort. Every frequency has n number of modes depending on boundary conditions - I know that much but, find it difficult to relate to so many concepts in which modes get mentioned and they baffle me at times. I want to...
  12. J

    Help plotting interacting Turing modes

    Hello, everybody. I'm trying to replicate plots from Yang et al. 2002. Spatial resonances and superposition patterns in a reaction-diffusion model with interacting Turing modes. Phys. Rev. 88(20) using Mathematica, to explore specifically under what parameter values the pattern of...
  13. S

    Degenerate Modes in Photonic Crystal Cavities: Examining Resonant Frequencies

    Can two degenerate modes have different resonant frequencies? I am asking question in context of resonance in photonic crystal cavities. I am reviewing a paper (I have attached it). Figure 2 (a) and (b) of this paper show modal profile for 2x2PCRR (photonic crystal ring resonator). In...
  14. K

    Why do TEM modes need two conductors to propagate?

    Why do we need two conducting surfaces to allow TEM modes to propagate through a waveguide? Why can we not propagate TEM waves through a single conducting waveguide?
  15. R

    Can somebody explain boundary conditions, for normal modes, on a wire?

    I don't really understand boundary conditions and I've been trying to research it for ages now but to no real avail. I understand what boundary conditions are, I think. You need them along with the initial conditions of a wire/string in order to describe the shape of motion of the string. I...
  16. R

    Form of the displacement, y(x,t), for the normal modes of a string

    Homework Statement The displacement, y(x; t), of a tight string of length, L, satisfies the conditions y(0, t) = \frac{\delta y}{\delta x}(L,t) = 0 The wave velocity in the string is v. a) Explain what is meant by a normal mode. Give the form of the displacement, y(x; t), for the normal...
  17. K

    Number of modes for a 2d crystal

    Hi, I have problems with the following: Number of modes for a 2d crystal with one atom per primittive unit cell. 1. Number of discrete vibrational modes? Should there be 2N of them? That is what I come up with if I think of one transverse and one longitudinal mode for each k. But I am...
  18. W

    Solving for degenerate oscillatory modes for three connected particles

    Homework Statement a) Write down the Lagrangian and show that the equations of motion are: m\ddot{θ_1}+k[2θ_1-θ_2-θ_3] = 0 m\ddot{θ_2}+k[2θ_2-θ_1-θ_3] = 0 m\ddot{θ_3}+k[2θ_3-θ_1-θ_2] = 0 b) Show that the mode in which θ_1 = θ_2 = θ_3 corresponds to constant total angular momentum...
  19. Spinnor

    B-mode plots, spherical harmonics?, fundamental modes?

    If the B-mode sky plots could be Fourier transformed what would be a plot of the lowest order B-mode harmonic plotted on a sphere look like? I guess we need two functions of spherical coordinates, one function for amplitude at points on a sphere and one function for the orientation at the...
  20. T

    How Does the BICEP Measurement Indicate Inflation Near the GUT Scale?

    I wrote it in another thread but it got lost in the middle of the other comments. So, here goes my doubt: In some places I am reading things like the following: For example here: http://motls.blogspot.com.ar/2014/03/bicep2-primordial-gravitational-waves.html#more Where in the whole...
  21. Greg Bernhardt

    Press Conference on Major Discovery - primordial B modes?

    Press Conference on Major Discovery -- primordial B modes? Anyone have more information on this? Any speculation? http://www.spaceref.com/news/viewpr.html?pid=42751
  22. U

    Optics: Whispering gallery modes in large systems

    While reading about whispering gallery modes, I have learned that whispering gallery modes can be seen for "microscopic spheres or toruses" -Wikipedia- , But can they practically be observed in relatively large prisms or glass spheres (m or even cm magnitude) ?
  23. N

    Understanding Degenerate and Hybrid Modes in Rib Waveguide Structures

    Hi, I am looking into some simulations of rib waveguide structures using Finite Element Method. I particularly solving modes for a 2D cross section of the optical waveguide, looking at TE and TM modes. My questions is about modes called "degenerate" and "hybrid" modes. I haven't found...
  24. C

    How Do You Determine Normal Modes in a Coupled Spring System?

    Homework Statement So I'm given two horizontal masses coupled by two springs; on the left there is a wall, then a spring with k_{1}, then a mass, then a spring with k_{2}, and finally another mass, not attached to anything on the right. The masses are equal and move to the right with x_{1}...
  25. A

    Vibrational modes of a discrete particle string

    I just want to make sure I understand the normal modes of a vibrating system of particles with discrete spacing. I have tried to drawn what I understand as the lowest and highest frequency mode of the standing waves. Is the drawing correct? Edit: actually I have drawn the maximum frequency where...
  26. N

    Normal Modes of a Triangle Shaped Molecule

    Homework Statement A molecule consists of three identical atoms located at the vertices of a 45 degree right triangle. Each pair of atoms interacts by an effective spring potential, with all spring constants equal to k. Consider only planar motion of this molecule. What are 6 normal modes and...
  27. ajayguhan

    Understanding Normal Modes of Objects - Linear vs Non-Linear Particles

    What does one mean by normal mode of an object? Why is it 3n-5 for linear particles, 3n-6 for non linear particle where n is the number of particle.
  28. carllacan

    Finding normal modes of a 3D object

    Hi. I'd like to find the normal modes / harmonics, displayed in a dB - Hz graph, of a given 3D object, namely a wind instrument shaped like a hyperbolic con with holes. I'm trying to perform simulations on Comsol Multyphysics, but I don't know how to do it. Is Comsol the best suited software...
  29. Z

    Uncovering the Mystery: Higgs Decay Modes and the Weight Paradox

    Under the Higgs in wiki it says "Another possibility is for the Higgs to split into a pair of massive gauge bosons. The most likely possibility is for the Higgs to decay into a pair of W bosons (the light blue line in the plot), which happens about 23.1% of the time for a Higgs boson with a mass...
  30. S

    TE, TM and TEM Modes in Lasers

    Greetings everyone, I am confusing the definitions in the title of the post all the time. I have books about lasers, yet none of them explain these concepts lucidly and clearly in my opinion. For example, what is our reference plane when we are dealing with semiconductor laser diodes and...
  31. N

    Does amorphous solids support phonons or nomal modes of vibration.?

    Does amorphous solids support phonons or nomal modes of vibration.?? Can we apply the concept of phonons and Debye Model in case of amorphous and poly-crystalline solids?? http://en.wikipedia.org/wiki/Phonon http://en.wikipedia.org/wiki/Debye_model The links I have attached above...
  32. N

    Normal modes of a string thought experiment

    Hey! So If I have a stretched string of length L fastened at one end, and I am moving the other end sinusoidally, will a standing wave appear ONLY if I move the other end with one of the normal-mode frequencies of the string? If not, will the resulting wave be a moving wave which is a...
  33. O

    Equipartition Theorem and Number of Modes

    I was looking at this page: http://en.wikipedia.org/wiki/Molecular_vibration And saw that they have six different vibrational modes listed for the water molecule. Elsewhere on they page they discuss the "3N-6" rule for determining the number of vibrational modes of a polyatomic molecule...
  34. A

    What Are Acoustic Phonon Modes in Calculating Heat Capacity of a Solid?

    In calculating the heat capacity of a solid due to the phonons in the low temperature limit, I am given the impression that the idea is to calculate the amount of standing wave modes available for the phonons in the solid. Is this the correct idea? But then in calculating the Debye temperature...
  35. A

    Optical and acoustic modes

    Basically phonons in crystals can either be acoustic or optical according to my book. But then it stresses that a necessary condition for this to hold is that the crystal has more than atom per primitive basis. The optical modes are then when neighbouring atoms oscillate out of phase (i.e. no...
  36. F

    CMB polarization: the E and B modes

    Hi all! In Ruth Durrer's book "The Cosmic Microwave Background" there is this picture (Fig. 5.2 page 193) about the E and B mode of the CMB polarization: http://imageshack.us/photo/my-images/11/s7o6.png/ http://imageshack.us/photo/my-images/11/s7o6.png/ They represent the E and B...
  37. M

    Are Muons and Tauons Higher-Dimensional KK Modes?

    Muons and tauons as KK modes?? Hello, everybody: I have (what I think is) a silly question. We all know that μ and τ particles are just as electrons, but with larger mass. Could it be that they are heavier Kaluza-Klein modes of the e in a higher dimensional theory, where the extra dimension...
  38. J

    Optical waveguide modes with different speed, what happens?

    Hi, I'm new on the forum and I would like to start with a question. I've searched for a reply in old posts with no success. If you can help me to find an answer I'll be very glad. Talking about optical modes inside a waveguide. If a waveguide support two different modes, say TM and TE mode...
  39. S

    Normal modes of a two mass, two spring system?

    Homework Statement I have a system of two masses m1 and m2 coupled by two springs with constants k1 and k2. If m1 and m2 are equal what would be the normal modes for this system? Homework Equations Equations of motion for the system: \begin{align*} m_1\ddot{x}_1 &=...
  40. B

    Help with finding normal modes of a bar swinging on a string

    Homework Statement A bar with mass m and length l is attached at one end to a string (also length l) and is swinging back and forth. Find the normal modes of oscillation. Homework Equations L=T-U, and the Lagrange-euler equation, I=(1/12)ml^2The Attempt at a Solution So my idea is this. Use...
  41. dexterdev

    What Are TE/TM Modes in Electromagnetic Waves?

    Hello PF, I have a doubt. polarization refers to the plane of Electric field right?, then linearly polarized wave is TEM and circularly may be TE/TM right? Please someone clear my doubt... What is this TE/TM (m n) modes mean...Any helpful animations other than falstad.com links...
  42. M

    Bell State of two non-orthogonal modes

    Is this possible? If I have, say a photon and two non-orthogonal polarizations \mid0\rangle and \mid1\rangle, can I create a Bell state \mid10\rangle+\mid 01\rangle If not, what is the reason? Thank you :)
  43. S

    Understanding Raman Mode Representation at Specific Wave Numbers

    Why we describe Raman modes At perticular wave number by E1 or A1,A2 or other If E1 say at 645cm-1, Why we cannot describe A1 at this wave number. How we write the representation at perticlar wave number. Please reply.
  44. P

    What Are Residual Modes of Vibration?

    what exactly are residual modes of vibrations? I have come across this terminology in various fem solvers like ansys and pam crash.
  45. reddvoid

    Identifying Wave-guide modes in rectangular wave guides

    How to identify type of wave-guide mode here, like its TE or TM TE01 , TE10, TM11, TE02, TE20 . .. I read number of half wavelengths in x direction is the m and number of half-wavelengths in y direction is n. . .but I can't figure-out how . . .can somebody please explain
  46. U

    Normal Modes - 2 springs question

    Homework Statement Homework Equations The Attempt at a Solution When i do the matrix multiplication of the 2x2 and 2x1 matrix, I get 2 conflicting solutions that don't match at all! So which one do i take to find ratio of X and Y?
  47. brainpushups

    Normal Modes; Rod suspended from strings

    Homework Statement A thin uniform rod of length 2b is suspended by two vertical light strings, both of fixed length l, fasted to the ceiling. Assuming only small displacements from equilibrium, find the Lagrangian of the system and the normal frequencies. Find and describe the normal...
  48. Spinnor

    QED; electrons and photons, different fields, modes of a common field?

    In the Standard Model of particle physics are we to think of the electron(positron) field and the photon field as separate fields? Is it possible to think of the electron(positron) field and the photon field as just different "modes of vibration" of some more basic field? Can this line of...
  49. B

    Small oscillations: How to find normal modes?

    Hi, I'm studying Small Oscillations and I'm having a problem with normal modes. In some texts, there is written that normal modes are the eigenvectors of the matrix $V- \omega^2 V$ where V is the matrix of potential energy and T is the matrix of kinetic energy. Some of them normalize the...
  50. V

    How fast can you 'switch' between superconducting and normal modes?

    The title, basically. If we're at a temperature below the critical temperature (let's just say for a Type 1 superconductor) and an applied magnetic field less than the critical magnetic field, it will be in the superconducting state. But if we increase the field beyond the critical point, it...
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