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. N

    What is the format for ionic lewis structure w/ resonance?

    Homework Statement I need to draw NH4NO2 which is an ionic compound. 3. The Attempt at a Solution NH4 is fairly straightforward to draw, with one N in the middle and four H surrounding, and no lone pairs. The problem comes with NO2- which is one nitrogen bonded to two oxygens. However, one...
  2. S

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    Homework Statement A certain spring elongates 9:0mm when it is suspended vertically and a block of mass M is hung on it. If driven by a force of variable frequency, at what frequency would resonance be obtained?a. is 0:088 rad/s b. is 200 rad/s c. is 33 rad/s d. is 1140 rad/s e. cannot be...
  3. AdityaDev

    Resonance in String: Understanding Wave Interference According to Book

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  4. U

    Quark Scattering and Quark Flow Diagrams

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  5. Jewish_Vulcan

    How does resonance of waves work?

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  6. F

    Resonance in string instruments

    Can resonance occur at multiple frequencies for the same given instrument? For example, in a violin, each note on a given string (say A) resonates and is the loudest only at a specific point on the string. Since each note on the same string can resonate, and each note has a different frequency...
  7. J

    Setting up an LRC series circuit with coupled coils

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  8. K

    When does resonance take place?

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  9. J

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  10. Z

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    In the reaction :e,p→e,p,η; (p,η)is called a "baryon resonance",a state of which is "S11(1535)". (http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.86.1702) In Particle Data Group,there is an excited nucleon N(1535).Are they the same? But how could a (p,η)resonce be called excited...
  11. 8008jsmith

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  12. 2

    Transforming DC to AC: The Role of Inductors and Capacitors in RLC Circuits

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  13. Matt atkinson

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  14. K

    Engineering Resonance in a circuit with L and C

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  15. M

    How to Test Amplitude-Phase Response of Sensors and Circuits using Arduino DUE?

    Arduino DUE based project for testing amplitude-phase response of the sensor or circuitry. Resonance frequency detection based on zero phase crossing, range up to 250 kHz. Check it out : https://coolarduino.wordpress.com/2014/12/24/lcq-meter-amplitude-phase-characterizer-piezo-tester/...
  16. Y

    What really are resonance structures?

    This is a concept I have never really understood. I mean to say is how can we include such a thing in a theory? How can we use them if we know that they don't actually exist? Are they some sort of calculation tool?
  17. D

    Physical resonance of inductor

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  18. Z

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  19. K

    Will an unbalanced wave be able to induce resonance?

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  20. V

    Resonance in electron impact on atoms

    Can someone please explain the significance of resonance levels that forms when electron collides with atoms. How this resonance levels are different from other levels ?
  21. O

    Standing Waves and Resonance in Fixed-End Transverse String Vibration

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  22. Rugile

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  23. J

    Induction Heater - HalfBridge Series Resonance Circuit

    Hi All, I am glad to have found this site as it offers a great range of information. I have looked through similar threads before posting this and didn’t find anything that answered my questions. I am to build an induction heater(cooker type) using a half bridge series resonance circuit as a...
  24. E

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  25. S

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  26. SalfordPhysics

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  27. M

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  28. H

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  29. R

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  30. Rugile

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    Homework Statement An AC voltmeter connected to the nodes A and B shows the same value as when connected to the nodes A and D (refer to attachment). What is the inductance of the inductor? What value does the voltmeter show? The inductor is ideal. U = 70sin(314t) V, C = 80 μF, R = 500 Ω...
  31. M

    The Oxygen in HOCOO-: Does it Participate in Resonance?

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  32. rpthomps

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    Good afternoon, I am working my way through the Feynman lectures and I am stumped at Chapter 23, Resonance. Specifically, the derivation of equation 23.12. I have followed up to that point but the appearance of tan (theta) baffles me. The equation is below: Any help would be greatly...
  33. A

    Resonance - rlc series circuit

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  34. A

    Chemistry Resonance Structures for a Certain Molecule

    Here attached is a question from my exam. My TA removed 1 point out of 7 for a reason. Can anyone decipher for what? There's the writing in red but it is illegible to me. I don't understand to what he refers by 8 and 6 t or +, or whatever he wrote. http://imgur.com/igpyp8V Or can anyone write...
  35. C

    Resonance frequency of heating coil

    I am doing R&D and have been hit by a problem. I want to find the resonnce frequency to my heating coil without having to hook it up to the rest of my oven. I fall into the problem because I don't have the stray funds to buy a frequency generator. I heard that with capacitors and an oscilloscope...
  36. R

    Radially symmetric "Breathing" resonance of a sealed water filled tube

    Please could someone explain to me what is meant by the radially symmetric "breathing resonance" of a sealed water filled tube or cell? That is with the use of transducers this can be achieved, but what does it mean? is it talking about generating a standing wave in the fluid? It relates...
  37. A

    Chemistry Resonance Structures for a Certain Molecule

    Please look at the pictures. I do not understand why they have not included the resonance structure for that molecule for which all the double bonds are displaced is not included.
  38. D

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    Hello all! Homework Statement Consider a cylindrical cavity with length "d" and radius "a". Find the corresponding electric field, and the dispersion relation therein. Homework Equations Maxwell's equations. The Attempt at a Solution I tried to solve the appropriate vector Helmholtz...
  39. Q

    Are these statements about resonance true?

    Homework Statement Are the following statements true? 1) All contributing resonance structures must have the same net formal charge. 2) All atoms in contributing resonance structures must have complete octets. The Attempt at a Solution The first one strikes me as true. Net formal...
  40. Q

    Resonance structures for nitric oxide

    Homework Statement Is N triple bond O with a radical on oxygen a valid LS for the nitric oxide molecule? Homework Equations Max number of valence electrons in a shell - 2n2. Oxygen is in second row of periodic table. Max valence electrons: 2(2)2 = 8. The Attempt at a Solution I...
  41. gfd43tg

    Engineering Finding values of RLC circuit given resonance frequency

    Homework Statement A series RLC circuit is driven by an ac source with a phasor voltage Vs = 10∠30◦ V. If the circuit resonates at 103 rad/s and the average power absorbed by the resistor at resonance is 2.5 W, determine the values of R, L, and C, given that Q = 5. Homework Equations...
  42. A

    Resonance in a Mechanical System

    Homework Statement A mass m is attached to one end of a massless spring with a force constant k and an unstretched length l0. The other end of the spring is free to turn about a nail driven into a frictionless, horizontal surface. The mass is made to revolve in a circle with an angular...
  43. U

    Water Column Resonance Time Interval Calculation

    Homework Statement There is a cylindrical vessel of cross-sectional area 20cm^2 and length 1m is initially filled with water to a certain height as shown. There is a very small pinhole of cross-sectional area 0.01cm^2 at the bottom of the cylinder which is initially plugged with a pin cork...
  44. J

    Forced oscillations: solution of Differential Equation at resonance

    Homework Statement Following a worked example in my book, I have been trying to get a solution for the equation \frac{d^2u}{dt^2} + \frac{k}{m}u = Fcos\omega t The book says that at resonance, i.e. when \omega_0 (the natural frequency) = \omega (the forcing frequency), the term F cos\omega...
  45. T

    What is the difference between resonance in a vacuum and resonance in a medium?

    So we're studying resonance. It says that it occurs when an external periodic force acting on a body is exactly equal to the natural frequency of the body. The body then begins to vibrate with greater/increasing amplitude and intensity. And so what I want to know is that is there a...
  46. P

    Resonance - How does it occur?

    Resonance -- How does it occur? I am having a little difficulty with the concept of resonance. Could someone explain how resonance occurs and how elastic oscillation relates to resonance?
  47. T

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  48. C

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    Making resonance using "simulated inductor" (op amp) I want to have a circuit that responds strongly (gives me a good measurable voltage) to a 10kHz sound input. To do this, I thought about hooking up a microphone and making a resonance circuit (using inductor and capacitor) to amplify the...
  49. N

    Resonance feedback loop on guitar

    Hey guys, I was messing around with my guitar (classical guitar) and my amp lately. I put the treble on lowest, bass highest, reverb highest, mid highest and mid frequency lowest. When I pluck a string when my guitar is close to the amp, the amplified sound from my amp causes that string to...
  50. U

    Measuring Speed of Sound with Resonance Tube Experiment

    Homework Statement A student performed the experiment to measure the speed of sound in air using resonance air-column method. Two resonances in air column were obtained by lowering the water level. The resonance with the shorter air column is the first resonance and that with the longer air...
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