Resonance Definition and 659 Threads

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...

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...

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...

Searching through Wikipedia (http://en.wikipedia.org/wiki/File:Resonance.PNG), I found this graph about resonance. I do notice from the graph that as the driving frequency gets closer to the natural frequency of the system, the peaks of the curves (i.e. the amplitudes) of the curves increase...

Hello I would like to understand the resonance phenomenon that can occurs when we deals with satellite's orbits. Here what it is said about it : KAULA - Theory of satellite geodesy - p. 49...

Homework Statement An open organ pipe has a fundamental frequency - corresponding to the first resonant length -of 262 Hz. The room temperature is 20.0°C. What is the length of the pipe. [The answer is 0.66m] Given: 262 Hz and 20°C Homework Equations v = 332 + 0.59t v = f λ...

Hi, Dumb Question #1251: What I understand so far (which maybe incomplete or wrong): in any system with multiple objects orbiting a larger body (either star+planets or planet+moons) each body can have an influence on the others, such that large bodies such as stars and big gas giants have...

I was reading this article from Wikipedia on resonance structures: http://en.wikipedia.org/wiki/Resonance_(chemistry ) What I do not understand is, what is meant by potential energy in terms of chemistry? In physics, potential energy is defined by location in a force field. What is it that...

Hi. When using spectrum analyzer to measure the response of a coil (a RLC circuit), I see that there is a peak at one frequency (resonance frequency). This is logical because we can model a coil as a RLC circuit. If I change the frequency of the sinusoidal source, the peak reduces its value...

Hi, Need help with this circuit. I am task to find out the resonance frequency of this circuit. R=30 ohms L=20mH C1=2uF C2=3uF If it is just R,L and C1 and I easily calculate the resonance frequency by applying the formula f=1/2âˆâˆšLC Now I have another capacitance C2...

Homework Statement Compare the cyclotron resonance signal from Silicon in figure 28.9b (in Ashcroft and Mermin) with the geometry of the conduction band ellipsoids shown in figure 28.5, and explain why there are only two electron peaks although there are six pockets of electrons. Homework...

Homework Statement What does Q-factor and Dynamic resistance of a parallel resonance circuits mean?Homework Equations The Attempt at a Solution In general, their performance is measured by a dimensionless parameter named quality factor Q, which characterizes the sharpness of the resonant peak...

Hi all, I'd like to know what if we have a scatteing process A+B > C > E+D, what is the relation between the width of the resonance peak of the particle C at plotting the inv. mass of particles E and D and the total width of C . Regards, S.

Hello, I have written 3D FDTD code with Mur ABC which gives correct results for time domain data. Now I want to compute the resonance frequency of a rectangular cavity using this 3D FDTD code. I don't know how I will do that. Would someone please advise me the steps I need to follow now to...

The chips used for surface plasmon resonance are fairly expensive. Does anyone know what nanofabrication techniques are used to make the chips? I've been told they are relatively easy to make if one has access to a nanoscale facility.

Quick question: I keep seeing the following terms in my reading on nuclear magnetic resonance: - Spectral linewidth - Spectral bandwidth - Signal bandwidth Are these all qualitatively different terms? Or are they more or less referring to the same thing?

I`ve started reading up and practically making various resonance structures of various molecules. Though in the book I am reading I have only been subsituted with the information that it can be very necessary for chemical mechanics later on in the book. Is this correct? Also, the book doesn`t...

My physics buddy and I have been having a debate. I was claiming that even under the natural Earth's magnetic field that with good signal to noise ratio based on the radar systems scaled appropriately the top layers of the Earth could be seen. He claimed that the signal to noise ratio of the T1...

Homework Statement We have this circuit: (uin+)---[1/jωC]--[jωL]--[RL]----o------uout+ (resistor of value R connecting the two lines at their o's here) (uin+)-------------------------o------uout- Find an expression for the quotient of u(in)/u(out), and then find the resonance...

We know that we get first resonance when the length of the air column is λ/4. We get second resonance when the length of the air column is 3λ/4. This is because we get a node at the surface of the water after λ/4 distance in the first case and 3λ/4 in the second case. My question is that what...

Hi, first time asking questions in this forum. I am self-learning classic mechanics this summer using Laudau's book and so far I feel everything is pretty interesting and makes sense for me. But still, I have some questions that needed to be answered. One of them is about the parametric...

I'm not exactly sure what I'm trying to ask, and I'm not very keen on laser physics, so bear with me. If I have a system in an excited state that can decay by spontaneous emission with a certain lifetime, what is the effect of placing it in a cavity with a mode resonant with this transition...

How do I derive A? As you can see in the attachment, I tried to substitute x and expand the equation but I got stuck. How do I get rid of the δ and cos and sin to get the result in the end? Please help!

Hi all Here, I attached a figure presenting the Lorentz-Drude function. The resonance number is clear from the m in the equation. But I like to know if the number of poles in Lorentz model is the same as the number of resonance or not. I am confused. I would be very grateful if you can help me...

Hello. What oscillating field strength, in tesla, is required to cause the magnetization vector of a ferromagnetic material to precess with a fairly large angle at its resonance frequency? I can't find this number anywhere!

I have a circuit that is two inductors and a capacitor in series, in the order inductor, capacitor, inductor, and I want to know what the resonance frequency of the system is (see image). I've heard before that, given the inductors are not coupled, it is just 1/2π√((L1+L2)*C), however, I am not...

I need to write the lewis dot structure along with the 3 resonance forms for CH3CNS. This is what I had but it was wrong. Not sure what to do. Thanks.

Hi I had a quick question. From what I understand resonance is when a natural frequency of an object is matched by the driver frequency however in this graph it seems as though resonance is occurring at all the frequencies around the natural frequency just not to a great extent...

I'm trying to better understand this circuit: https://www.circuitlab.com/circuit/qnxkke/lc-chopper/ and how the added inductors (L3, and L4) and Capacitor create a harmonic. I fully understand how to calculate the resonance for the main circuit but how would I calculate the harmonic that the...

Homework Statement Please refer to the attached image. For the first question, The solution calculated the wavelength,λ by taking the whole length of the string (0.75m) as equal to 3λ/2. What I don't understand is, since the string have to bend to produce a wave, how can we just...

Greetings PFers, I'm designing a demonstration unit for use in grade schools demonstrating the principle of resonance upon wine glasses (shattering them). I intend to put a wine glass into an acrylic chamber of some geometry, hand the student a microphone and see if they can generate the...

When one causes the air column in a closed pipe to vibrate in its well-known modes (harmonics) or a plucked string to vibrate similarly, how is the exciting energy distributed amongst the modes?

Homework Statement Estimate the fundamental frequency of resonance sound induced by blowing on the open end of a half liter bottle Homework Equations f= 1c/4L The Attempt at a Solution i don't know the length of L, what's half liter bottle ..? What does it tell you? 2 x f1?

Homework Statement If both k of the spring and m are doubled while the damping constant b and driving force magnitude F0 are kept unchanged, what happens to the curve, which shows average power P(ω)? Does the curve: a) The curve becomes narrower (smaller ω) at the same frequency; b) The curve...

Homework Statement In class a 3 m long aluminum bar was made to resonate by clamping it at a node in the centre of the bar. The frequency heard was 1200Hz. Homework Equations L = \frac{n}{4}\lambda v = f\lambda The Attempt at a Solution Knowing that L is 3, we can...

Why did they calculate angular frequency if the question asked for frequency? Also why is kx=mg? Wouldn't that mean the spring is at equilibrium?

I have a potential well which is an infinite wall for x<0 and a linear slope for x>0. There is damping proportional to velocity. Basically, it's a ball bouncing elastically off the ground and with air friction included. I wonder if there is some periodic driving force which will cause one...

Homework Statement I need to be able to determine the equivalent parallel resistance of an RLC parallel circuit, from a measured voltage when the circuit is at resonance. Homework Equations The Attempt at a Solution I know the values of the circuit element, but I'm not sure how...

Hi everyone, I am using a signal generator in series with a RLC circuit, generating an AC signal at 1kHz. I have my probes connected across the resistor When I change the timescale the Fres bandwidth changes on the spectrum analyzer. At 1mS the resonant bandwidth is from 25kHz-50kHz At...

So, I've been covering these concepts recently in a few of my classes, and I'm wondering if the bandwidth is always centered on the resonance frequency? I assumed it was. However, in a recent problem given, it is shown that the bandwidth of a band-pass filter was not centered about the...

Hi all. I am currently building a series RLC circuit as a magnetic field transmitter. Because I want to have a strong magnetic field, I need high voltage by making the circuit at resonance. Here are the parameter I used: L:1.15mH R: 50 (internal resistance from functional generator )+...

I don't really understand the relationship between the wavelength of a stationary wave and the length of the air column. I also don't know what happens when the wavelength changes. I would appreciate it if you could help.

This is concerning a resonance effect in the linear 2nd order system (mechanical, electrical, etc) that seems to create signal power/energy within the system. I am sure this impossible apparent energy creation has some plausible explanation in laymen’s terms, does anyone care to take a shot at...

any one knows why sound wave reflects at the opening end of the resonance tube? is the air inside the tube different from those outside. from the expriment, when the incident wave interference with the reflected one, the destructive point reachs almost zero showing that the reflected one has...

Hello, fellow Physicians! Wait, that's not right. . . Anyways, I've been teaching myself a little about resonance just for my own ends, and I have a few questions about resonance, specifically in relation to libation holders. First of all, WHY does hitting a wine glass produce its resonant...

The Question: The cross section for the scattering of two particles with spins sa and sb via a resonance with spin J is: \sigma(E)=\frac{\pi\lambda^{2}(2J+1)}{(2S_{a}+1)(2s_{b}+1)} \frac{\Gamma_{i}\Gamma_{j}}{(E-E_{0})^{2}+\frac{\Gamma^{2}}{4}} with \lambda=1/p, E is the centre-of-mass energy...

Hello, I was just wondering what the natural frequency (of a wineglass) depends on, i would say density of the glass, the shape, thickness, could anyone tell me about in more detail? Does this apply for any object (as the object gets bigger it becomes more complicated and...

Hello, I am having difficulty discerning which resonance structures are considerable enough to include and which are so unimportant that they should be discarded. There seems to be no general rule on this that I can find, so I was wondering if such a rule existed or if someone can lead me in...

I made a helmholtz resonator by myself and played its resonace frequency sound to it. Obviously, the resonator resonated and near the open end of resonator, I could feel wind. So I placed candle near the opening to see the strength of wind. Surprisingly, If decibel of soundwave was constant...

Hi I'm trying to understand how the sum over spin polarizations is treated when using the Narrow Width Approximation(NWA) with a spin 1 resonance. For a spin zero resonance there is no such problem and the factorization is quite straightforward. I'll go through some details to explain where...