Resonant Definition and 195 Threads

  1. M

    Relation between electrical and mechanical resonant frequency

    My first post here. :D usually this situation does not arise, but I am working on thin piezoelectric films. When a apply a alternating voltage on the electrodes, the film vibrates. Now this constitutes a LCR circuit which has a resonant and anti-resonance frequency. Since it is vibrating, it...
  2. H

    Resonant wavelength of a cavity resonator using different internal materials?

    Hello everyone, Recently I have been studying cavity resonators. I noticed that all cavity resonators have air in them, but I was wondering what the effects would be if something other than air was used? For the sake of simplicity let's say we put a dielectric material in it with a...
  3. S

    Ionization resonant frequencies

    Is it true that by finding exact resonant frequency we could ionize matter or split molecules? What is frequency to split water molecules into H+ and HO- ions? What is resonant frequency to split up hydrogen atom into proton and electron? Would spliting water molecule require less energy...
  4. H

    Series capacitance added to parallel resonant tank changing the resonant freq?

    HI all, A parallel tank circuit at resonance has a theoretical infinite impedance. However due to the resistance of L and C some power is dissipated so a small current will flow from the source. If a parallel tank circuit is oscillated at it's resonant frequency and a capacitor (C2) is...
  5. L

    Prove the lorentzian function describes resonant behavior

    Homework Statement Resonances occur in many physical systems, and are often observed by measuring the frequency response of the system to an applied driving force. use the example of a damped harmonic oscillator to show how the lorentzian function serves as a good description of resonant...
  6. H

    AC Signal Amplitude Modulation in Resonant Tank Circuit

    I recently simulated a parallel resonant tank circuit on multisim. I put an oscope across the tank circuit and I get an AC signal, but what interests me is that it is amplitude modulated. The oscillations slowly build up in amplitude, hit a peak and then die back down. I think that the...
  7. N

    Understanding the Physics of Resonant Tunneling Diodes

    Hello :) , Does anyone know some good paper or book from were it's possible to learn physics behind of work of resonant tunneling diode(RTD)? In last semester I had course in ˝microelectronics and nanoelectronics˝ and we studied basic principle on which RTD works, and it was very interesting...
  8. N

    Negative Resistance in Resonant Tunneling

    Hi, I am a student who's learning about quantum mechanics. I was reading about the RTD (Resonant tunneling diode) and I got the general idea. However, I was looking at a I vs V graph and came up with a question. Since Resistance = V/I, the inverse slope of the I vs V graph has to be the...
  9. R

    Human Body Resonant Frequencies

    Since the old topic is locked, I had to post a new one about this (old topic here: https://www.physicsforums.com/archive/index.php/t-231156.html" ) People were talking about resonant frequencies for body parts and/or the entire body and someone was looking for a chart, not sure if this is...
  10. A

    How to find formula for resonant frequency of a forced oscillator.

    In a damped forced harmonic oscillator the amplitude is determined by a series of paramenters according to : A = (Fo/m)/ (sqrt( (wo^2-w^2)^2+(wy)^2) ). where Fo= driving force, m=mass of spring wo=natural frequency of system. w=driving frequency y=damping constant. Now my...
  11. N

    How to find the resonant frequency of this circuit?

    Homework Statement Given this circuit: [PLAIN]http://img546.imageshack.us/img546/2921/resonance.png Homework Equations How does one find the resonant frequency? (Since there are no values for the components, I assume this means find the formula). The Attempt at a Solution I...
  12. C

    Opinions Needed - Resonant Radiant Energy

    Hi All, First post and very new to this. I'm a bit of a Tesla fan and have been experimenting with a few designs after viewing many theories on YouTube and various web sites regarding Tesla's radiant energy research. In a nutshell my theory is this:- What if we build the equivalent of an RF...
  13. B

    Help with resonant frequency in ACC

    In an AC circuit, where there is only one ideal inductor and resistor, the resonance frequency occurs if the impedance of the inductor is equal to the resistance of the resistor. Why? I hope you understood the question and looking forward for explanation. thanks!
  14. V

    Some lines are called resonant

    some lines are called "resonant" Hi, I would like some explanation on a topic for which I do not find detailed literature online or in books. In photon absorption/emission processes by atoms, some lines are called "resonant" (for example, the 2P1/2 (or 2P3/2) to 1S1/2 transition of...
  15. D

    Relationship Between Tension And Resonant Frequency.

    1. I have to find out the relationship between tension and resonant frequency in a length of rubber, using stationary waves. 2. I know there is an equation for the resonant frequency in a length of string, given as f= 1/2L * sqrt T/μ . I am however imagining that as this is a rubber band...
  16. P

    Resonant Frequencies and Natural Frequencies

    Hi everyone, So, resonance, are resonant frequencies and natural frequencies the same thing with a different name? If not could someone please explain the difference. Been searching for the answer for over an hour. Thanks in advance Peter
  17. A

    What Is Resonant Energy Transfer and How Does It Work?

    i wonder if anyone can make me to understand the phenomena of resonant transfer of energy. advanced thanks.
  18. H

    What causes of voltage runaway in series LC resonant circuit?

    I'm trying to understand why the voltage in a series LC resonant circuit exponentially rises? Can anyone explain exactly what happens that creates the effect? I've been wonding if it the distributed capacitance of L becomes a voltage multiplier, or if it is a voltage wave reflection...
  19. H

    Lowest Resonant Frequency Issues

    Homework Statement A 138 cm length of string has a mass of 4.98 g. It is stretched with a tension of 6.35 N between fixed supports. What is the wave speed for this string? What is the lowest resonant frequency of that wave? (wavelength) = 138cm = 1.38m M = 4.98g = 0.00498kg Ft =...
  20. E

    Power Factor and Resonant Frequency

    Homework Statement [PLAIN]http://img705.imageshack.us/img705/4462/40230468.jpg Homework Equations Power Factor = True Power / Apparent Power f = 1 / (2*pi*root(LC)) Z = root(R^2 + (Xl - Xc)^2) = R The Attempt at a Solution a)i) 1? Because it's purely resistive, but this...
  21. L

    Resonant behaviour of damped beam

    hi all i have a problem in finding the quality factor of cantilever beam (one end is fixed and other end is free ) vibrating in air /other medium? how the qualtiy factor expression for beam is calculated? whether all these expressions applicable to micro and nano cantilevers. please explain...
  22. L

    Resonant behaviour of damped beam

    hi all i have a problem in finding the quality factor of cantilever beam (one end is fixed and other end is free ) vibrating in air /other medium? how the qualtiy factor expression for beam is calculated? whether all these expressions applicable to micro and nano cantilevers. please explain...
  23. M

    Is there a tool to measure resonant frequency?

    For a science investigation, I want to investigate how different factors affect the resonant frequency of wineglasses, however, I need some way to measure the frequency quantitatively. Is there some kind of computer program that can do so through the computer microphone? And if so, would the...
  24. M

    Can Anomalous Dispersion Enhance Resonant Cavities for Solar Cell Applications?

    In anomalously dispersive media, the change in phase velocity with wavelength is negative; that is dv/dλ < 0. I wanted to ask: (a) whether you could fit a wide range of frequencies into a resonant cavity by taking advantage of anomalous dispersion (b) whether a material like this exists...
  25. P

    Open air columns/ resonant length help

    Homework Statement Hollow tube chimes are made of metal and are open at each end. One chime is 0.54 m long. A) if the speed of sound is 346 m/s, what is the frequency of sound produced by the third resonant length? B)What would happen to the frequency of sound produced by the third...
  26. B

    Self Resonant Freq of Spiral Inductor

    Is there a model for determining the self resonant frequency of a flat spiral inductor? I can determine the inductance but the capacitance is escaping me. Thanks for any help.
  27. O

    Pipes and resonant mode with a node in exact center

    Homework Statement What kind of pipe can never have a resonant mode with a node in the exact center? (choices are closed on both ends, open/closed on one end only. open on both ends) why? Homework Equations none given The Attempt at a Solution I think its closed on both ends...
  28. L

    Astrophysics: question about nearly resonant orbits

    astrophyscs: question about nearly resonant orbits Homework Statement are any planets in low-integer resonant or nearly resonant (within two or three percent) orbits Homework Equations p2/p1 The Attempt at a Solution ok suppose to find for the planets of 55cancri so like 55cancri b...
  29. A

    Resonant frequency of an annular ring? Hookes Law?

    Hi, I am trying to work out the resonant frequency of an annular ring, does anyone know a general equation for it? For example the ring has an outside diameter = OD and inside diameter = ID. The ring is gently clamped at the outside diameter and a force F applied evenly at the inside...
  30. F

    Identifying resonant frequencies in various objects

    Hi I was wondering if someone would be kind enough to help me with a project I have at the moment. Here is the scenario; I am playing various tones through a speaker system at a fridge and I need to be able to detect which of the tones make the fridge resonate. I have been using a...
  31. Q

    Resonant modes of simply supported square plate

    I did this in ANSYS, but I am wondering what is the analytical solution to this. Does anyone know?
  32. H

    How much current can you draw from a resonant loop antenna

    In the case of a loop antenna with uncompensated inductance, the magnetic field generated by the current in the antenna is in antiphase to the incoming magnetic field of the EM wave. So it is believable that the current which causes cancellation of the flux through the antenna is the maximum...
  33. M

    What is the Earth's natural resonant frequency?

    (Is there one?) What is the Earth's natural resonant frequency?
  34. M

    Energy gain in a resonant system

    Something is bothering me about passive systems in resonance. Consider the Bode plot of a second-order system, for example: http://en.wikipedia.org/wiki/File:Harmonic_oscillator_gain.svg Let's say we excite this system near its resonance, so the system has a gain > 1. I don't understand...
  35. P

    What are the resonant wavelengths?

    Homework Statement Consider pipe of length L. The pipe is closed at one end and open at the other allowing a standing wave where a node exists at the closed end and a max exists at the open end. a) what are the resonant wavelengths? b) If L=5, what is the lowest frequency? Homework...
  36. S

    Resonant frequency vs Natural frequency

    I happened to sit in a presentation where the presenter displayed 2 separate values for resonant frequency and natural frequency. It was my understanding that the both are same and now I am in doubt. Please explain - if there is and you know - the difference between resonant frequency and...
  37. K

    Finding the transfer function for a parallel resonant circuit

    Homework Statement Hello, so I'm trying to solve the transfer function for a parallel RLC filter that goes like -------Resistor ------------------- |XXXXXXXXXXXXXXXXX|XXXX| |XXXXXXXXXXXXXXXXX|XXXX| VinXXXXXXXXXXXXXXXXCXXXXL |XXXXXXXXXXXXXXXXX|XXXX| |XXXXXXXXXXXXXXXXX|XXXX|...
  38. M

    Help Finding Amplitude of Voltage Across Capacitor At Resonant Frequency

    Hi, here is the question: For part b) I have to find the amplitude of Vc at the resonant frequency with I=1A, I have found Zeq and well here are my equations: \frac{jwL+R}{\ jwRC-w^2LC+1} and I have the equation for w at the resonance:w= \sqrt[2]{\frac{L-R^2C}{\L^2C}} I know at the...
  39. H

    Fundamental Resonant Frequency of a Waveguide

    Homework Statement For a given rectangular waveguide the cut off frequency of the fundamental mode is 6.5GHz. What is the fundamental resonant frequency of a 30mm long cavity made from the same waveguide? Homework Equations Unsure The Attempt at a Solution I would have...
  40. C

    Engineering Solve Resonant Circuit Problem with 220mH & 6 Ohms

    hello, im a quite stuck on how to answer this question on resonant circuits. any help would be most appreciated! Homework Statement a coil of inductance 220mH and resistance 6 ohms is connected in parrallel with a capacitor across a 230volt variable supply. if the circuit goes into...
  41. I

    What is the formula for determining the resonant frequency of drums?

    Homework Statement Hi, I'm new to this forum. I'm a musician and recording studio owner. I'm not good at physics although I read "The Physics Of Music" and I am interested when in physics when it concerns musical instruments in particular. What I would like to know is a formula to...
  42. F

    RLC Circuits - Resonant Frequency, Power

    Homework Statement An AC circuit consists of an alternative emf of 1 V connected to a resistor of 500 Ohms, an inductance of 0.4 mH, and two capacitors connected in parallel of 50 pF each, We want to find the resonance frequency of this circuit, the maximum power dissipated by the...
  43. T

    Resonant Structure of Nitrate Ion in AgNO3: Draw a Possible Solution

    Homework Statement Draw at least one resonant structure of the nitrate ion in AgNO_{3}. The Attempt at a Solution Is this a possible resonant structure of the nitrate ion?
  44. A

    Does Energy Decay Occur in Sealed Metal Boxes with Excited Resonant Modes?

    Hey there, I recently solved for the resonant modes in a 3d metal box. Thats nice, but I was wondering about how to actually excite the modes (its a sealed metal box) Supposing I actually excited these modes by shining incident em radiation such that a portion [of the incident wave]...
  45. D

    Critical Damping in Multi-Modal Resonant System

    Let's say I have a system with multiple oscillatory modes. Is it possible to have anything in this system that resembles critical damping?
  46. H

    Oxygen energy levels and resonant wavelengths?

    How many energy levels the oxygen atom have? What energy (in eV) is required to get to each level. From my research i have only been able to find the first two levels, the first of which is a forbidden level. 1.=.98eV 2.=1.63eV
  47. A

    Find Q Factor of Resonant Amplifier Circuit

    How find Q factor of this resonant amp cct.because "R" is not theare, cant apply " Q=( ωL/r) or =(Dynamic R/ωL) "
  48. I

    Using a DC Choke in Resonant Circuits w/ Capacitors

    Can a DC choke (inductor) filter be used in a resonant circuit with a capacitor? If connected in series with a capacitor will the two resonate, or will the signal passed be half wave? I thought all inductors can be interchangeable but some have certain applications such as DC applications.
  49. N

    Engineering Resonant frequencies of simple RLC circuit

    I need to find the resonant frequency of the circuit shown in the diagram. http://img216.imageshack.us/img216/1750/gdmn.jpg The loop has a value of 1H, the capacitor has a value of 0.2F and the resistor has a value of 10 ohm. My initial approach has been to try and find the total...
  50. K

    How to Calculate the Resonant Frequency of a Preloaded Spring Assembly?

    Hi all, I have a problem at work, I have been asked to work out the resonant frequency of an assembly within our mechanical face seal. We have a mass (the face) attached to springs that are preloaded. The springs are fixed at the other end and the face is also pressed up against the seat...
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