What is Resonance: Definition and 657 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. F

    Engineering Please explain Circuit resonance in a Crystal Radio?

    Homework Statement I'm in grade 11 working on a science fair project I found on this site: http://www.sciencebuddies.org/science-fair-projects/project_ideas/Elec_p014.shtml Grade 11 physics doesn't cover much so I'm confused about why the radio is set up the way it is... I know that...
  2. C

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  3. P

    Greenhouse Gases and Resonance

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  4. jegues

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  5. D

    Detecting resonance Q factor with a change in dielectric properties.

    I have seen some examples where a system has a resonance frequency, and, when the system changes, its Q factor also changes, and so the resonance frequency shifts, and this shift can be measured to detect the change in the system. An example I can think of is very sensitive mass measurement...
  6. dillmon

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  7. A

    Is Hybridization Affecting Molecular Planarity and Aromaticity?

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  8. dillmon

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  9. S

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  10. C

    How Does Resonance Occur with Wavelength and Layer Thickness?

    What does the below senetence mean? I don't understand it, maybe because of my not so good english. "When the wavelength becomes of the same order as the layer thickness, resonance occurs. " Does it mean when the wavelenght and layer-thickness are exactly equal (e.g. both 0.1m)? Thanks.
  11. D

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  12. A

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  13. K

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  14. Saitama

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  15. T

    Question about Natural Frequency and Resonance

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  16. W

    What is the role of resonance in the heating process of a microwave oven?

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  17. S

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  18. S

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  19. S

    Understanding Resonance and its Relationship to Frequency and Displacement

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  20. N

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  21. A

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  22. W

    Why are Vc and Vl larger than Source current at resonance in an RLC circuit?

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  23. G

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  24. J

    What does Resonance Frequency mean?

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  25. N

    Carbon Monoxide: four resonance structures?

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  26. D

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  27. P

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  28. R

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  29. E

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  30. jaketodd

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  31. A

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  32. B

    Would a Deimos/Phobos orbital resonance affect Mars?

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  33. F

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  34. F

    Prove this Total Voltage at Resonance

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  35. A

    Question on nuclear magnetic resonance and Larmor frequency

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  36. B

    SH driven oscillator amplitude at resonance equation

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  37. R

    T2 in Nuclear Magnetic Resonance & MRI

    I want to understand MRI and what exactly is T2. I have read the November issue of Sci-am and I'm still confused what exactly is T2 as it has different descriptions. The article "The Incredible Shrinking Scanner" by Bernhard Blumich: "The system can also monitor the precessing spins as they...
  38. R

    Acoustic Resonance of a Building

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  39. S

    Understanding Harmonic Resonance in Power Systems

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  40. M

    Resonance Stabilization when electrons can't donate?

    A question in ExamKrackers asks us why triphenylmethanol is so acidic. Link to the structure below: http://en.wikipedia.org/wiki/Triphenylmethanol Explanation: I'm not seeing how the lone pairs on the Oxygen could donate into any of the rings though. It can't donate those electrons onto the...
  41. Y

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  42. H

    Feshbach resonance for Li: repulsive and attractive?

    Hello, I am looking into the Feshbach resonance for Fermi gas (Lithium in particular). The following is unclear: Is it correct to say that there is a repulsive interaction between the atoms in the regime, where the scattering length is positive? I have found various sources saying so...
  43. K

    Confusion about frequency and resonance of tuning forks?

    hello. ok so i know that if you have two tuning forks of the same natural frequency, one can stimulate the same frequency to another and resonance is achieved. but what if I have a 100 Hz tuning fork and say maybe a 180 Hz tuning fork. If a strike the 100 Hz one, how will the other one be...
  44. K

    Accuracy of Resonance Lab Experiment

    Homework Statement Hi! We did a resonance lab using a closed air cloumn and 3 different tuning forks, each with different column lengths and i collected the data as follows: frequency(hz) column length(m) # of wavelengths wavelength(m) speed of sound air temp 384...
  45. C

    Why doesn't resonance result in infinite energy transfer?

    I have a question about resonance. According to this graph, http://en.wikipedia.org/wiki/File:Resonance.PNG When no damping force (the red line), there should be no energy loss due to frictional force or other damping force. So the energy should be fully transferd to the system from the...
  46. B

    How Can I Find Resonance Frequency and Create a Schedule for Input Resistance?

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  47. R

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  48. T

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  49. G

    Engineering RLC circuit close to resonance

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  50. H

    Relation between cavity resonance and sound speed

    Our sound will be like "Donald Duck" if we inhale helium gas and the explanation from web is because" The cavity resonances which determine the vocal formats would be raised by the higher sound speed,"(http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html). Why cavity resonance raise as...
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