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. J

    Question On Resonance- Intuitive feeling required

    I am not able to intuitively sense the concept of resonance. Let us say we have a building having a fundamental frequency of 5.5 Hertz . If the ground moved to and fro(during an earthquake) with a frequency of 5.5 Hertz, the building would vibrate strongly, or resonate.Right? I am not...
  2. B

    Resonance frequency in an LCR circuit

    Hello everyone! I've been trying to derive the expression w = sqrt( (1/(LC)) - (R_l^2 / L^2) ) where w is the resonace frequency, L is the inductance of the inductor, R_l is the resistance in the inductor, R is the resistance of the resistor and C is the capacitance of the capacitator...
  3. A

    Can Acoustic Resonance Be Produced with a Wavelength of 20cm and 32 cm Tube?

    I need help with a question about acoustic resonance. Sound of wavelength 20cm is produced at one end of a 32 cm long tube. Is it possible for resonance to be produced?
  4. J

    Will Changing the Air Column Length in a Pipe Create Resonance in Helium?

    Here's the situation: you have a pipe in a bucket of water and can vary the length of the air column in the pipe by raising or lowering it. Here's my question, hope someone can help. The speed of sound in helium is three times greater than the speed of sound in air (340m/s). Under these...
  5. E

    What are the resonance heights for a tuning fork and resonance tube experiment?

    "A tuning fork with a frequency of 440 Hz is held above a resonance tube partially filled with water. Assuming that the speed of sound in air is 342 m/s, for what heights of the air column will resonances occur?" f1 = 440 Hz v = 342m/s I'm not sure if this is referring to an open pipe, or a...
  6. U

    Archimedes Principle and resonance

    i got 2 qn , 1 on archimedes principle and the other on resonance 1)The Artic Ice cap is a floating ice mass. If the ice were to melt, how would the depth of the ocean change? my ans was that it will become deeper but the ans was it will remain the same...why? 2) my understanding is...
  7. tony873004

    Understanding Strong & Weak Resonance

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  8. S

    Resonance in Closed Air Coloumn

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  9. A

    Why does resonance in Kundts tube differ from theoretical calculations?

    I made an experiment in a tube, 75 centimeters. There was sand in it so I could distinguish one wave length. the biggest one I got was 0.335 meters at a frequency of 480Hz and the smallest was 0.07 meters at a frequency of 2000 Hz. I calculated the resonance in the tube as 1.5 meters as the...
  10. L

    Resonance: harmonic resonance

    I'm researching theory, resonance. All I found was resonance as the name of phenomena although I need to figure out who and when it was advocated. Does anyone know when resonance was advocated by whom? I found the term harmonic resonance. Can anyone help me?
  11. B

    How Does Building Height Affect Resonance During Earthquakes?

    i have undertaken an investigation, where the aim is to establish a relationship between the frequencies of an earthquake, and the height of the building(at maximum deflection parallel to motion). to do this, a model was created; a building of lego blocks and a vibration generator set to...
  12. L

    Researching Theory Resonance: Who Advocated, When & How?

    I'm researching theory, resonance. Anyone knows who and when advocated theory resonance and how it developed? It may not be appropreate in this forum, but I heard we have theory resonance in psychological aspect. Please help me!
  13. D

    Help with physics resonance

    There's a metal cylinder from which water is flowing out at a rate of 10^-6 m^3/s. A tuning fork of 300 Hz is placed on top of the cylinder. At what water levels will the first two resonance frequencies be heard? It doesn't seem like a difficult problem, and it really isn't. I just can't seem...
  14. C

    What is the natural frequency for a child's swing with 2.00 m long chains?

    Please help me with this, it's one of the 'basic' problems and I can't do it at all. "The chains suspending a child's swing are 2.00 m long. At what frequency should a big brother push to make the child swing with largest amplitude?" Okay, so... the largest amplitude comes with a natural...
  15. W

    Understanding Resonance Frequency Decrease in Oscillation Systems

    In an Oscillating system,as damping increases, the amplitude of the system at the resonance frequency decrease and the resonance frequency also decreased. However why does the reasonce freq decrease? I know how to solve for the new amplitude and ang. freq. mathematically but i do not know how to...
  16. E

    Does this solution exhibits resonance

    In a question, I've been asked to find the general solution of the equation: \ddot{x} + \omega^2{}_{0} = cos( \omega t) (\omega , \omega_{0} > 0, \omega \neq \omega_{0}) I've found the solution to this. It then asks me if this solution exhibits resonance. What does this mean and...
  17. A

    Why Does Spring Oscillate Horizontally?

    I am asked to explain why an oscillation spring will eventually begin oscillating in the horizontal direction, i.e. become a pendulum, and I am asked why a mass that is too great will not become a pendulum. I know the answer to the first part of the question. The spring has a natural tendency...
  18. S

    CO3- (2-) Ion: Resonance Structures

    1) The CO3 (2-) ion has a maximum of a.two resonance structures involving two single bonds and one double bond. b.two resonance structures involving one single bond and two double bonds. c.three resonance structures involving one single bond and two double bonds. d.three...
  19. E

    Exploring Stability and Resonance in Unstable Circuits with Right-Side Poles

    Can a circuit that has transfer function with poles in right-hand side part of the imaginary-real plane (unstable system) have resonant frequency?
  20. B

    Is there a physical interpretation of unbounded oscillations in RLC circuits?

    I've done some questions on RLC circuits where I have a second order differential equation of the form: L\frac{{d^2 q}}{{dt^2 }} + R\frac{{dq}}{{dt}} + \frac{q}{C} = E\left( t \right) The solution of this equation gives an expression for the charge as a function of time, q(t). Just off the...
  21. W

    Need Assistance with "QCD and Resonance Physics"

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  22. I

    Solving Resonance Problem in Air Columns

    Problem with Standing Waves in Air Columns Hello, I'm having problems with this problem, lol...so far, i have found one of the main components of the following question, but I don't know where to go from there. please help Water is pumped into a tall vertical cylinder at a volume flow rate...
  23. S

    Understanding Resonance in AC Circuits: Exploring its Purpose and Applications

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  24. T

    Formula for calculating w0 (w at resonance)

    Hi dudes. sory if it is not the correct area for this question. A question. What is the formula for calculaing w0 (w at resonance) in a two-branch parallel circuit consisting of: A voltage source branch 1: R1 + L (in series) branch 2: R2 + C (in series) I thought it was the same as RLC...
  25. A

    What Are Surface Plasmons and How Do They Relate to Maxwell's Equations?

    what is "plasmonic resonance" hi, could somebody who is familiy with "plasmonic resonance" tell me about it? thank you!
  26. T

    Resonance in a coupled circuit

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  27. tony873004

    10th Planet resonance with Neptune

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  28. W

    How Does the RF B1 Field in NMR Spectrometry Flip Net Magnetization?

    NMR rf Field hi all, could anyone help me explain how the rf B1 field in an NMR spectrometer works? Especially the mechanism it uses to flip the net magnetisation by an angle of 90 or 180 degrees? Would be very gratefull for a link or and explanation to this. Thanks Wadings
  29. F

    Finding particle data on the higgs resonance width?

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  30. C

    Resonance and natural oscillations

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  31. S

    How Do You Optimize Damping Constant for Maximum Resonance?

    Given a system where a damped spring has natural frequency equal to the frequency of the input oscillations, how do I choose a damping constant in order to maximize the response of the spring? Are there any issues with choosing a zero damping constant? (as this would surely provide the...
  32. C

    Resonance pde wave equation u(\phi,t) involving lagrange polynomials

    1/sin(phi) * d/d\phi(sin(phi) * du/d\phi) - d^2u/dt^2 = -sin 2t for 0<\phi < pi, 0<t<\inf Init. conditions: u(\phi,0) = 0 du(\phi,0)/dt = 0 for 0<\phi<pi How do I solve this problem and show if it exhibits resonance? the natural frequencies are w = w_n = sqrt(/\_n) =2...
  33. M

    Resonance Waves: Investigating Graphs & Errors

    :uhh: I am havin a bit of trouble w/ a graf here... its about resonance waves in resonance tubes and i have a straight line graph when i plot the values of length of the wave vs. 1/frequency. the problem is, i don't no what this line/slope is meant to represent? and it doesn't run through zero...
  34. B

    How is position information obtained in an MRI scan?

    Hi, I'm taking a course on medical imaging (mainly MRI), and I'm having trouble understanding NMR. Can anyone explain what this is all about in plain language? Here is what I make of it: Odd-numbered nuclei possesses a total spin of magnitude 1/2 and an associated magnetic moment (why is...
  35. N

    One SImple prob and another about resonance

    Q1: Which are true: A) If the mass of the pendulum doubles, the period increases. B) If the ship accelerates upward, the period does not change. C) If the ship moves upward with a constant velocity, the period decreases. D) If the ship accelerates downward at 9.8 m/s2, the pendulum will...
  36. S

    Lab writeup, resonance & speed of sound

    ok I'm definitely having trouble with this lab due tomorrow. We did a lab in class where you get an adjustable tube and use different tuning forks. With the different frequencies of the forks we adjusted the tubes until it reached resonance? (loudess point) Alright so we got a bunch of numbers...
  37. Clausius2

    Exploring Fission Resonance & Nuclear Power Plants

    When one looks at the diagram neutron energy vs. probability of fission \sigma_f (measured in barns) there is a zone of resonance, characterized by peaks and valleys on the function \sigma_f. Why doesn't conventional nuclear power plants works in this zone, instead of using a moderator to slow...
  38. T

    Calculating Frequency in Standing Wave Resonance

    so my problem deals with resonance in standing waves if you have a standing wave in a long pipe of length 2.90m and that is closed on the left end and open on the right end and the graph of it is as below, with x-axis the position along pipe and y-axis vertical air displacement...
  39. S

    Exploring Resonance of LCR Network - Help Needed

    I'm currently writing up a physics practical which looked at the resonance of the impedance of an LCR network. I'm trying to look for theoretical information on the internet, but am struggling to find relevant information. The LCR circuit I used had the inductor and resistor in series, then...
  40. A

    Practical Project Help : The Resonance of different pieces of metal.

    Hello forum. I'm in abit of a mess. My high school physics class is in the process or doing individual investigations into an aspect of physics we are slightly familar with. I had planned out an experiment to do with sound, but last minute i was told another person was doing something...
  41. S

    Resonance frequency of an object

    hi this is not physics homework I really need to find out the natural frequency of a window size glass so that I can brake it with a couple of speakers. this is not a prank joke either. I need a practical way to find it help please. So far all i know is that the frequency is low by hitting it...
  42. L

    Resonance In Electric Circuit

    This isn't really a homework question. I'm just trying to figure things out for myself about resonance in a circuit that they haven't taught us yet. Say you have a circuit Rp || L || C and you have a sine source and some load connected to it call it Re and you want to mesaure the gain. Vi...
  43. Y

    What is the resonance frequency expression for a parallel RLC circuit?

    What is the resonance frequency expression for a parallel RLC circuit? I know that for a series RLC circuit, it is: w=\frac{1}{\sqrt{LC}} Is it the same for a parallel RLC circuit? I remember reading somewhere that it was not exactly the same, although it approaches the series RLC...
  44. N

    Identify Resonance Structures

    Hey There are two questions asking me to identify the resonance structures for: SO4 two minus and H3PO4 (sorry, I don't know how to do subscripts) Could someone please explain to me how to do these resonance structures? Thanks.
  45. J

    Is Resonance the Key to Powering Oscillators with Weak Inductive Sources?

    Hi, I have a general question about resonance (specifically electrical). I have been working on a device dealing with this and I thought I might make sure I got the basics right before I continue. I have two scenarios that I'm hoping someone can help me out with: 1. There is a basic...
  46. J

    Earth Resonance Power Generator

    Hello Everyone, I have a quick and dirty question to ask. I have earlier posted about how to make a coil resonate at the Schumann resonance frequency (or multiples of if), and thank you all for your help so far. I thought I may as well tell you what I am trying to do here. I have an idea for...
  47. J

    Earth Resonance Power Generator

    Hello Everyone, I have a quick and dirty question to ask. I have earlier posted about how to make a coil resonate at the Schumann resonance frequency (or multiples of if), and thank you all for your help so far. I thought I may as well tell you what I am trying to do here. I have an idea for...
  48. N

    I have trouble understanding the concept of resonance

    lets say a structure has 3 resonance structures, i konw that the atoms don't move, but i read somewhere that the electrons do...hmmm and that the resonance hybrid is most stable ofthe resonance forms?? I am confused, what exactly is resonance? in actuallity, isn't there no resonance , just...
  49. C

    Can Nuclear Magnetic Spin State Change and Emit at Larmor Frequency?

    Hello, consider a dihydrogen molecule in a powerful magnetic field and an x-ray that is hitting this molecule. Many things could happen in this case I think: compton effect, ionisation, electrons changing orbitals, nuclear magnetic spin state changing... My question is: can I be certain...
  50. B

    Find Resoance Frequency for Electric Motor Mass of 100 kg

    "An electric motor of mass 100 kg is supported by vertical springs which compress by 1 mm when the motor is installed. If the motor's armature is not properly balanced, for what revolutions/minute would a resonance occur?" I set my frame of reference at the end of the spring. Therefore, F =...
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