What is Resonance: Definition and 656 Discussions

Resonance describes the phenomenon of increased amplitude that occurs when the frequency of a periodically applied force (or a Fourier component of it) is equal or close to a natural frequency of the system on which it acts. When an oscillating force is applied at a resonant frequency of a dynamic system, the system will oscillate at a higher amplitude than when the same force is applied at other, non-resonant frequencies.Frequencies at which the response amplitude is a relative maximum are also known as resonant frequencies or resonance frequencies of the system. Small periodic forces that are near a resonant frequency of the system have the ability to produce large amplitude oscillations in the system due to the storage of vibrational energy.
Resonance phenomena occur with all types of vibrations or waves: there is mechanical resonance, acoustic resonance, electromagnetic resonance, nuclear magnetic resonance (NMR), electron spin resonance (ESR) and resonance of quantum wave functions. Resonant systems can be used to generate vibrations of a specific frequency (e.g., musical instruments), or pick out specific frequencies from a complex vibration containing many frequencies (e.g., filters).
The term resonance (from Latin resonantia, 'echo', from resonare, 'resound') originated from the field of acoustics, particularly the sympathetic resonance observed in musical instruments, e.g., when one string starts to vibrate and produce sound after a different one is struck.

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  1. K

    Engineering Resonance in parallel RL-RC circuit

    Homework Statement calculate R2, so the resonance is still posible ? C = 40 μF R1 = 30 ohm L = 9mH image : http://postimg.org/image/kampvczv5/ Homework Equations ω = 1/sqroot(L*C) c = 1/(ω*C) XL = ω * L Z = (Z1*Z2)/(Z1+Z2)The Attempt at a Solution My approach was to first calculate the...
  2. T

    Damped Harmonic Oscillator and Resonance

    Homework Statement On June 10, 2000, the Millennium Bridge, a new footbridge over the River Thames in London, England, was opened to the public. However, after only two days, it had to be closed to traffic for safety reasons. On the opening day, in fact, so many people were crossing it at the...
  3. P

    Can you use a tank circuit to produce an AC circuit?

    Since the resonant frequency of a tank circuit, is completely adjustable, and controlled by the value inductor and capacitor you use, I was wondering if it had any other uses, other than increasing its impedance at its resonant frequency. Can if be used to produce ac signals of its resonant...
  4. Tom MS

    I Resonant Frequency of an Atom in an Atomic Clock

    Beam standard atomic clocks work by changing the magnetic state of a cesium atom by applying a microwave frequency that matches the resonant frequency of a cesium atom. What is this resonant frequency of the atom in terms of actual events that occur on the atomic level...
  5. B

    Wine Glass Resonance Frequency

    Homework Statement Question 1: When analysing AP French's Formula for Frequency of Wine glasses, what is the direct relationship between the Frequency heard (at different levels - fd) and the level of water from the top of the glass (d). I know that as the level of water from the glass...
  6. Z

    Resonance frequency of a wine glass experiment

    Homework Statement My group and i need to do an experiment for school. We decided to investigate the effect of water level in a vine glass (or volume) on the resonance frequency. Basically does the resonance frequency change when you change add water to the glass. I would just like some help...
  7. Ronie Bayron

    A How Resonance in general, differ In Chemistry and Physics

    Hi, I am just confused, regarding some definition above, I hope anybody can help explain differences. Does atoms resonate when subjected to some wave?
  8. Resul

    Ear Resonance Frequency: L=5 cm, Water Velocity 1500 m/s

    A person is swimming underwater and his ear canal of length L=5 cm is filled with water. It can be treated as a column of fluid open at one and closed at the other(eardrum). Velocity of in water is 1500 m/s, at what frequency will his ear be most sensetive due to resonance in his ear canal?
  9. R

    Help with Nuclear Magnetic Resonance

    Please explain Nuclear Magnetic resonance and how it is applied to other fields? I know it has to do with magnetic field around atoms and stuff like spectroscopy and imaging. But please correct me and please go in dept with Nuclear magnetic resonance.
  10. Priyadarshini

    Delocalisation of Charge Explained for Resonance Effect

    Hi, The book I'm following says that resonance depends a lot on the "delocalisation of charge". What does "delocalisation of charge" mean and how do I determine it? Does it mean the number of pi electrons? Thanks in advance!
  11. S

    How Do Resonances Differ from Virtual States in Quantum Physics?

    What´s the difference between a resonance and a virtual state? For comparison, a standard moderately lived state, hydrogen 2p state, has energy of 10,2 eV above ground, and width 4*10ˇ-7 eV. An example of resonance is Delta - with mass 1232 MeV, it´s energy is about 290 MeV above ground...
  12. P

    Localized surface plasmon resonance (LSPR)

    Hi! I wondering does anyone here has a clue of lowering the absorption level and narrowing the scattering bandwidth of LSPR of nanoparticles? Are those "intrinsic" properties or can be improved by modifying their size, shapes, etc? Thanks for sharing your thoughts! Paul
  13. DaveC426913

    Resonance vs Flutter: Explaining the Tacoma Narrows Bridge Collapse

    [Moderator's Note: This discussion was split off from another thread: https://www.physicsforums.com/threads/expunging-myths-from-the-classrooom.849853/] Well, engineering is not my field, so as a layman, I'm having trouble reading the nuanced difference between resonance and flutter. The Tacoma...
  14. N

    Change of energy loss in driven oscillations

    I find most textbook explanations of resonance lacking. My understanding is that resonance occurs becuase less "driving energy" is lost when the driven frequency approaches the natural frequency of a system. But why does the energy loss curve like this? Since Q-factor is different for each...
  15. J

    Drum Resonance Physics: Understanding How Tunings Affect Frequency

    Hello, I have recently picked up drumming and the topic of tuning has peaked my interest. I have gone over numerous sources (academic theses, Wikipedia, HyperPhysics, etc.) trying to piece together what is occurring when drums (right now tom with two heads, batter and resonant, are of most...
  16. A

    Why should resonance occur in benzene?

    the carbon in benzene is sp2 hybridized and the p orbital is involved in double bond.sp2 orbitals and p orbitals are perpendicular to each other,for any electronic transition between orbitals,the orbitals should not be perpendicular.so how does pi electron go to carbon's orbital?
  17. Anton Alice

    Understanding the Resonance of Dipol Antennas

    Alright. I have also a few questions concerning dipol-antennas: first: It has often been said, that the dipol antenna, in order to receive a certain frequency, needs to have a length of λ/2. I don't see a clear reason for that. If one would not know that, one had to calculate the Capacity...
  18. E

    Why is the resonance condition satisfied in a transverse resonance method?

    The Transverse resonance method is used to determine the propagation constant of a wave in several waveguides, like the rectangular waveguide, or also dielectric waveguides. It takes advantage of the fact that a standing wave is present along a certain direction (transverse with respect to the...
  19. S

    Resonance structures of aryl or vinyl carbocations

    I read that vinyl or aryl carbocations do not have resonance stabilization but I can't understand why that is the case. Below I have drawn some resonance structures for aryl and vinyl carbocations: Aryl carbocation: https://imgur.com/QwiHJg8 Vinyl carbocation: https://imgur.com/rKBs57d In both...
  20. U

    What is needed to allow sound to move an object

    I am interested to know what governs whether an object in the path of a sound wave will feel force. For instance will low frequency sound have more of an effect than high frequency? What difference does the material or shape of the object have on whether it would feel any force from the...
  21. C

    Finding Reactance Ratio in Electrical Resonance

    Homework Statement See the picture. If at electrical resonance ##U_c=60 V## and ##U_L=40 V##, find the ratio of reactances ##\frac{X_L}{X_c}##.Homework Equations [/B]##Z=\sqrt{R^2+(\omega L - \frac{1}{\omega C})^2}## , ## Y= \sqrt{\frac{1}{R^2} + (\omega C - \frac{1}{\omega L})^2}## , ##\phi =...
  22. G

    Forced oscillations and resonance (bis)

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  23. J

    I On liquid oscillation excitation

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  24. B

    Resonance frequency increasing with mass?

    For a spring and mass system, I've learned the resonance frequency of a system increases with decrease in mass. Not sure if this case is also related but when I attach a coin sized metal onto a piezoelectric material of a smaller size, the resonance frequency range actually goes up (from...
  25. Titan97

    Partial Bond Fixation in Naphthalene

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  26. B

    Plate mode shape subjected to damage

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  27. R

    H3CHCHC=NH Resonance in Sappling

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  28. ElegantSir

    Fundamental Frequency of 6m String Vibrating at 16.5Hz

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  29. D

    Is there a definition of "hyperdimensional resonance"?

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  30. spareine

    Why can't pinging excite singing overtones?

    I recorded the sound spectra of a singing wineglass (rubbed the rim with a wet finger) and a pinging wineglass (tapped anywhere at its wall) with a smartphone. Evidently the fundamental tones of both vibrations are identical, but the overtones are very different (harmonic vs. anharmonic). As the...
  31. J

    Car Oscillation Amplitude: Frequency & Constant Values

    Homework Statement The graph (see image in part 3) illustrates how the amplitude of a car's vertical oscilltions vary withthe frequency of an oscillating surface. I was asked to state the amplitude of the oscillation of the surface. I was told It stayed constant. Homework Equations Nil The...
  32. S

    Solving the Frequency of Sound Waves at 20°C

    1. a source of sound is directed a large brick wall. a girl walks towards the wall and notices that the intensity of the sound decreases to aminimum every 50cm. what is the frequency of the sound? the air temperature is 20 degrees celsius (answer is 344Hz)2. attempted to use the universal wave...
  33. getsubaka

    What are some real life examples of resonance?

    Homework Statement Which of the following situations is a result of resonance? a. Hydro wires "hum" as a mild breeze blows over them. b.A child pushes herself on a swing by moving her legs back and forth appropriately. c.Windows in your house rattle as a large truck drives by. d. Building...
  34. K

    Understanding Resonance: Co-lapsing Bridges, Glasses & More

    What exactly is resonance? I have bean reading some literature and I do not understand what precisely it is saying. But since that is very unspecific question, I will to ask some question that are puzzling me, to try to show more specific what I do not understand. 1. What exactly can resonate...
  35. Z

    Question about Resonance Cross Sections

    Hi All, I have a question about resonance cross sections. I have been doing the design work on the reactor I want to propose for testing at Oak Ridge National Labs, and have run into a problem. It is an accelerator driven reactor transmuting thorium into uranium, then burning the uranium by...
  36. J

    Nuclear Spin and Magnetic Resonance Imaging

    Hi pf, Please could someone kindly answer a few questions about proton spin in the context of MRI. As I understand it when an external static magnetic field is applied to a patient the magnetic dipole moments of the protons in the hydrogen nuclei will experience a torque causing them to align...
  37. M

    Understanding Resonance: Causes and Effects Explained

    What causes resonance? Why does a vibrating object only cause another object to vibrate of the two objects have the same natural frequency?
  38. mooncrater

    Question about resonance energy

    Homework Statement The question says that: Calculate the resonance energy for CO2 from the following ΔH(C=O)=339 kJ/mol ΔH(O=O)=498kJ/mol ΔH(C(s)→C(g))=718kJ/mol ΔHcombustion (carbon)=-393kJ/mol. Homework Equations none The Attempt at a Solution I am completely unable to understand how will...
  39. J

    Can a harmonic be louder than the fundamental frequency?

    This is not a homework question per se, but rather something I have come across during a homework project. Using Audacity, I recorded a few different instruments playing the same notes (investigating timbre). I noticed that (using a steel string acoustic guitar) the first harmonic at 131 Hz...
  40. ChrisVer

    Glashow resonance (UHE neutrinos)

    I'm obviously studying about neutrinos lately... So, I wanted to ask about the Glashow resonance. I don't understand what they mean when saying: http://arxiv.org/pdf/1108.3163v2.pdf (sec.2) Unfortunately I don't have access in the refs. If I understand this correctly, it says that the...
  41. Domenico94

    Exploring Magnets & NMR Schemes in Physics II

    Hi everyone...I'm just looking nmr schemes, and magnets, and, at the same time, studying Physics II and electromagnetic fields at my faculty of electronics engineering. I know this may sound like a "dumb" question, and I don't want to sound like councited or similar stuff, but I was just asking...
  42. binbagsss

    E+e- collison Resonance peaks cross-section partial widths

    Question: The Breit-Wigner cross-section for a resonance R is ## \sigma_{i \to f} =12\pi\frac{\Gamma_{R\to i} \Gamma_{R\to f}}{(s-M^{2})^{2}+M^{2}_{R}\Gamma^{2}_{R total}}## [1], where ##s## is the com energy squared, ##M_{R}## is the mass of the resonance , ##\Gamma_{R total}## is the total...
  43. C

    Understanding Cyclotron Oscillations Frequency

    I am having trouble making sense of the frequency of oscillations for a cyclotron. What I don't understand is, if a the voltage difference of the two dees is switched twice ( each time the particles are about to enter them), then why is the frequency of oscillation the same as the frequency at...
  44. blooperkin

    Understanding Resonance: Exploring the Basics and Common Misconceptions

    Hi! I have a few questions about resonance: 1) What exactly is the "amplitude of driver of oscillation"? And why is the amplitude of the driven object equal to the amplitude of the driver right from the start when the driver frequency is 0? 2) Is the driven system originally oscillating? 3)...
  45. Z

    Breit-Wigner propagator Of resonance

    Ｉ Want to analyze the decay from a excited nucleon to a nucleon and an Omega meson.I have seen a propagator which descripes a process : a→b+c (Eur. Phys. J. A16, 537–547 (2003), Covariant tensor formalism for partial-wave analyses ofψdecay to mesons ,B.S. Zou and...
  46. K

    Why is there a +R or -R effect?

    What I mean to say is that why are some substituent groups such that(during resonance) the pi electrons' delocalisation is directed away from it while some groups are such that delocalisation of pi electrons is towards those groups? Can you kindly give some examples too?
  47. K

    Does CH3NH2 undergo resonance? Why?

    And what are the conditions for resonance to take place?
  48. SIMON1

    What is the Equation for Determining the Resonant Frequency of a Drum Shell?

    Hi there I am currently doing a major thesis on the procedural generation of an acoustic drum kit, using PD (puredata). Now what I am actually doing is physically modelling the drum kit piece by piece, starting with the drum shell. I know that every aspect of the drum contributes to its complex...
  49. Kevin Spacey

    Describing how to make a standing wave?

    I'm struggling in physics class, and I really need help with this question. "If you are holding a spring in your hand and making waves, describe how to make a standing wave at the 2nd resonance frequency (next frequency over the fundamental). Include a sketch with your answer." What does this...
  50. Domenico94

    Where Can I Find Detailed Information about Nuclear Magnetic Resonance Machines?

    Hi everyone. I'm just looking for an online description of the nuclear magnetic resonance machine, with explanations of all components, and their physical principles...anyone can help me? Giving me any link to a website talking about it? In addiction, could be this be a valid topic for a...
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