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. A

    Singing in Helium: How Density Affects Resonance Frequency

    Homework Statement When you sing, the vocal folds in your throat act as a resonating cavity (one open end, one closed end) which allows only certain frequencies. Suppose you try to sing a pure tone which is detected by a microphone and measured to have a frequency 500.0 Hz. This is the...
  2. G

    Mechanical Resonance: Typical Frequency Ranges

    Is there any typical frequencies range which mechanical systems resonant at ?
  3. O

    Mechanical Resonance: Can Soldiers' March Cause 16 Hz?

    Q: If a bridge has a natural frequency of 16 Hz and assuming that a battalion of soldiers marches across it, will mechanical resonance occur? Personally, I was quite unclear about the physical implication of "16 Hz". In my interpretation, I feel that to cause a mechanical resonance on the...
  4. F

    Resonance, standing waves and bass

    Why is it that in a room, if you're close to any of the walls the lower frequencies of a sound become louder? Ofcourse, there's an interference pattern in the room. You can hear this by walking around and you'll notice that at some points the bass is weaker and at some points it's stronger (the...
  5. G

    Organic chem, resonance structure

    Homework Statement Are these two structures resonance? if not why not? Homework Equations The Attempt at a Solution I drew these resonance forms myself, but the answer book didnt' have this resonance structure in its answer and i wanted to know if this indeed is a...
  6. S

    Solving Resonance Structures of NH2OH Conjugate Base

    [SOLVED] Resonance Structures 1. Homework Statement [/b] Draw the major resonance contributors that show electron delocaliztion of the formal charge for the following ions, The conjugate base of .O .||... NH2 /..\ /...\\ / ...||...| ... \...//\ ....OH 3. The Attempt at a...
  7. R

    Why Might a Program Incorrectly Represent Resonance Structures?

    [SOLVED] Resonance Structure #3 Homework Statement Can't seem to figure this one out either...I think the program may have the charges messed up...usually if i post the same exact problem as the answer, it tells me that the answer is the same as the original problem...but with this...
  8. R

    Organic Chem - Resonance Structures #2

    [SOLVED] Organic Chem - Resonance Structures #2 Homework Statement Trying to figure out this resonance structure...Draw the lowest energy alternative.. http://img162.imageshack.us/my.php?image=553562cu7.jpg The Attempt at a Solution ive been trying to move the upper double bond...
  9. R

    Solve Lowest Energy Resonance Structure

    [SOLVED] Resonance Structure Draw the lowest energy alternative http://img87.imageshack.us/my.php?image=82956480uh8.jpg I can't figure out what I am doing wrong, but I've tried everything..any help?
  10. D

    Resonance (Differential Equations Class)

    [SOLVED] Resonance (Differential Equations Class) Homework Statement A front-loading washing machine is mounted on a thick rubber pad that acts like a spring; the weight W = mg (with g = 9.8 m/s^2) of the machine depresses the pad exactly 0.38 cm. When its rotor spins at \omega radians per...
  11. S

    Resonance and air columns open at one end and closed at the other.

    Homework Statement The question I'm working on is First the diagram:http://http://i215.photobucket.com/albums/cc10/Spookie71/image0-12.jpg There is the matter of the equation I use to solve the equation: Can you please explain for me? Scott
  12. S

    Resonance and understanding what a resonant is?

    Homework Statement http://i215.photobucket.com/albums/cc10/Spookie71/image0-11.jpg
  13. S

    Mathematica Resonance and rules for mathematical equations

    Homework Statement What is the wavelength of the lowest note that can resonate within an air column 42 cm in length and closed at both ends. Homework Equations Given: l = 42 cm n = 1 Required: \lambda Analysis: l = \frac{n\lambda}{2} therefore \lambda = \frac{2l}{n}...
  14. N

    How Low Can a Pop Bottle Go in Pitch?

    Is there a theoretical limit to the lowest note achievable in a closed tube(Pop bottle)? Heres the question in context: I've got what I believe to be the correct: http://img141.imageshack.us/img141/9301/1azw1.jpg ^^ May want to check that, if you don't mind ^^
  15. A

    Resonance Frequency-modal Analysis

    Using MSC Nastran 103 to calculate BIW (car's sheet metal platform only)resonance frequency by FE method, do we need to apply any constrains? I think, a free modal analysis means no constrains, however, final outcome (Hz)will depends on where forces are applied to the model ? Cross car...
  16. K

    Resonance Structures and VSEPR

    Hi, I'm having trouble figuring out which of the following molecules can be described using three charge-minimized resonance structures. Does anyone have any idea which molecules this would include? a. SF4 b. SO3 c. SO32- d. HSO4- e. SO2+
  17. O

    Determining Resonance of Rods for a Given Frequency

    Most of us have seen the experiment where a tuning fork that is resonating, makes another tuning fork resonant when brought close in proximity. Theres another one where small metal rods are mounted upright with plastic knobs on top (dont know if this is necessary), and two rods of same...
  18. S

    Can Humming in a Bathroom Stall Cause Resonance?

    The other day, I was in a bathroom stall doing my business, and I randomly started humming some song (can't remember exactly what it was). Well it just so happened that I hit the resonant frequency of that stall. Talk about a surprise! I could make a very quite sound with my mouth closed, and...
  19. T

    Electrical Resonance and Complex Numbers

    Homework Statement A circuit is said to be in resonance if it's complex impedance Z (in terms of R, L, and C (being the resistance, inductance, and capacitance)) is real. We are to determine the resonance angular frequency \omega in terms of R, L, and C. Homework Equations The circuit is...
  20. T

    How Do Resonance and Quasiparticles Differ in Physics?

    What is the difference between resonance and quasistable particles ?
  21. A

    Series or parallel coils for equal resonance

    I have a 555 out put connected to a coil and i get the frequency i need. But now i need the 555 to power more coils. How should i connect the coils to keep the same frequency. In parallel or Series? The 555 will not directly power the coils. It will switch a Mosfet and that will provide the...
  22. R

    Resonance and bridge collapses

    I remember the discussion of resonance from physics class a long time ago because of the illustration of the collapse of the Tacoma Narrows Bridge which was presented as a result of resonance resulting in part from the fact that the bridge's two suspended spans were the same length...
  23. T

    How Do Phase Relationships Affect Voltage Waveforms in an LCR Circuit?

    Homework Statement A sinusoidal input is applied to the circuit below. Sketch the waveforms of each of Vr (voltage of resistor), Vc (capacitor) and Vl (inductor) on the one graph with particular attension to the phases (the amplitudes are not important) Hint: Vc is proportional to the...
  24. B

    Acoustic Resonance in large water filled pipes

    say i have a 1.5m diameter and 7m lond pipe, blocked of at one end and leading into a 2.8m diameter horizontaly laid manifold (so that effectively you have one small pipe branching of another large pipe), the pipes are filled with water. In order to calculate the resonance frequencies, i would...
  25. 6

    Nuclear Resonance: Effects of Width

    Homework Statement The greater the width of the nuclear resonance,... a) the greater the rest energy of the resonance b) the greater the lifetime of the resonance c) the lower the rest energy of the resonance d) the shorter the lifetime of the resonance e) nothing Homework Equations...
  26. D

    What Is the Resonance Frequency in a Damped System?

    how can i get the resonance frequency for a damped system? x'' + 2r x' + w. x = F/m coswt r is the damping factor, w. the natural frequency it can be calculated that the amplitude, A=F/m / sqrt( (w.^2-w^2)^2-(2rw)^2) by differentiating wrt w, it is found the maximum amplitude...
  27. S

    Chemical resonance is legitimate and universal

    "Chemical resonance is legitimate and universal" We all know that Lignus Pauling was the creator of both concepts: Hybridization and resonance. VB theory centered its strength over MO theory in the fact that they were able to better explain the chemistry of carbon [organic]. Today...
  28. cepheid

    Cyclotron Resonance (Solid State Physics)

    Homework Statement Cyclotron resonance for a spheroidal energy surface. Consider the energy surface \epsilon(\mathbf{k}) = \hbar^2 \left( \frac{k_x^2 + k_y^2}{2m_t} + \frac{k_z^2}{2m_l} \right) where mt is the transverse mass parameter and ml is the longitudinal mass parameter. A surface...
  29. O

    Resonance Structures of PO4 (3-)

    hi :biggrin: please help. thankyouuu :] Homework Statement i am studying for my apchem exam in may.and got stuckup on a question. it's just a little exercise.so the answers aren't there.but ok here it is; give the resonance structures of PO4 (3-) and there's supposed to be four Homework...
  30. C

    What Is the End Correction in Resonance Column Experiments?

    Homework Statement In the experiment of the determination of the speed of sound in air using the resonance column method the length of the air column that resonantes in the fundamental mode with a tuning fork is 0.1m. When this length is changed to 0.35m, the same tuning fork resonates with...
  31. T

    Describe how resonance in a domestic spin-dryer could be overcome?

    Homework Statement Describe how resonance in a domestic spin-dryer could be overcome? The Attempt at a Solution The internal unit of a washing machine or spin-dryer normally includes a washing container, which has a laundry drum mounted in the container such that it can rotate, and an...
  32. J

    What does resonance frequency mean?

    What does resonance frequency mean? If you resonance glass is explodes in a way. Tesla claimed that the whole Earth could resonate electrically at 7Hz, 14Hz, 21Hz. What does that means?
  33. B

    Kondo resonance - need concept help.

    I've come across the Kondo effect in my research and specifically measuring the Kondo resonance. Now I'm sure I don't need to be an expert but I having some trouble clearing the concepts, the actual physics in my head. I know the Kondo effect is an exchange of spin do to an interaction...
  34. K

    Advantage and disadvantage of resonance

    I have always been wondering,what is the advantage and disadvantage of resonance.I am currently studying it right now,and i do know it had caused a bridge to collapse before.
  35. S

    Air Temperature Affects 512HZ Tuning Fork Resonance

    Homework Statement a 512HZ tuning fork held over a bottle receives its 1st harmonic when the level of water is 17cm from the bottle opening. what is the temp of the air Homework Equations sound equation The Attempt at a Solution I have no idea where to start.
  36. A

    Resonance Frequency Explained: Get the Answers Here

    resonance frequency! what is meant by resonance frequency ? i really can't get it. if anyone could help i will be gratefull.
  37. W

    Resonance effect in musical instruments

    would it be more accurate to say that Resonance is Essential for musical instruments or Desirable.
  38. H

    Understanding Resonance: Causes and Effects in Oscillating Systems

    Why does an oscillating system under resonance oscillate with the largest amplitude? And why does resonance occur when the driving frequency match the natural frequency? Can resonance occur at frequency other than natural frequency?
  39. M

    Resonance frequency of guitar string

    A guitar string resonates at 1260 Hz and 1575 Hz with no resonance frequencies in between. Find its fundamental(the lowest) resonance frequency. I know that fundamental frequency is the number of times it completes in one second, measured in hertz. In this specific problem, should I be...
  40. G

    Resonance need explanation (No maths)

    I know that when the applied frequency on a mass is equal to the natural frequency, the mass resonates. It has a great amplitude as a result of this. But I don't know how somethings affect the resonant frequency. Like for a mass-spring system. 1) What effect would increasing the mass have...
  41. A

    Alternating current about resonance width

    Since the question quite long and contains many formulas, so i take a photo instead. my question is that for part b since Z= \sqrt{R^2+(X_L-X_C)^2} can i subst X_L = (W_0+\triangle{\omega})L and X_C = \frac{1}{(w_0+\triangle{\omega})L} into the Z= \sqrt{R^2+(X_L-X_C)^2}...
  42. L

    Resonance of HCO3^- and sigma/pi bonds

    Are two equivalent resonance forms HCO3^- like this? ... O ...// O - C ...\ ... O - H ...O - H .../ O - C ...\\ ...O Both structures have brackets and a -. Also, each O on the left has six dots, the O on the double bond has four, and the O on the H has four as well...
  43. P

    Engineering What is the role of the resistor in a Parallel Resonance Circuit?

    Hi all. I have a Parallel Resonant circuit with a Capacitor in Parallel with an Inductor & Resistor in Series together. Capacitor on the left branch and Inductor & Resistor on the right branch. The question I would like to ask is what effect does the resistor have on the circuit? I...
  44. S

    Help with structural formula and resonance structure

    I don't know what I am doing wrong, please help. 2) How many different structual formulas can be written for C6H14 Include straight chain and branched chain compounds. Enter an integer as an answer. (I put in 5 but it say that I am wrong) 3) Which of the following...
  45. Orion1

    Exploring Resonance Square: A Fascinating Physics Experiment | SpikedHumor

    I thought that this would be an interesting video for physics majors: http://www.spikedhumor.com/articles/26352/Resonance_Square.html" I posted it here, because the experiment appears to involve 'wave function'.
  46. C

    How does sound resonance work?

    Here is an interesting application of sound resonance. I was sitting in my computer room when I noticed that if I sat forward in my chair and settled in a particular spot, the high pitched 'buzz' coming from my computer sounded extra loud. I concluded that I was listening to a resonance...
  47. L

    What Exactly Are Resonance Structures in Chemistry?

    Hi, I'm confused by resonance structures of molecules, what are they really? My teacher said resonance structures are in fact a decomposition of the actual molecular wave-function as a sum of simpler ones. Is this true? Or are they in fact simply pictures we draw when we can not classify the...
  48. D

    Can Understanding Natural Frequencies Lead to Lethal Resonance?

    Just a qns, how does resonance work? i know about the natural frequency stuff, but why and how does it occur? why in the 1st place do every object has a natural frequency and different natural freq. And by the way, if we know the natural frequency of a man, couldn't we potentially can kill...
  49. J

    Coil resonance on oscilloscope

    Hello All, I have been playing around with this digital oscilloscope and function generator that I am using at school. I first connected the function generator directly to the oscilloscope to get the hang of adjusting it, then I took a small coil I had laying around and connected it in...
  50. R

    What is the exact formula for calculating bubble resonance frequencies?

    This is very important. Can someone tell the dependency for the resonance frequencies of bubbles? i.e if know a bubble's diameter, the surface tension, the liquid and the gas' densities how do I calculate the sound wave frequencies that causes a resonance in a bubble. I have Landau's formula...
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