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.
Homework Statement
I need to draw NH4NO2 which is an ionic compound.
3. The Attempt at a Solution
NH4 is fairly straightforward to draw, with one N in the middle and four H surrounding, and no lone pairs. The problem comes with NO2- which is one nitrogen bonded to two oxygens. However, one...
Homework Statement
A certain spring elongates 9:0mm when it is suspended vertically and a block of mass M is hung on it. If driven by a force of variable frequency, at what frequency would resonance be obtained?a. is 0:088 rad/s
b. is 200 rad/s
c. is 33 rad/s
d. is 1140 rad/s
e. cannot be...
according to book "...Let us look at a particular wave crest generated at the left end of the string by a fork. It travels to the right end of the string, is reflected back, and is reflected again at the fork.Now it interferes with the next wave..."
doubt: the fork keeps vibrating and keeps...
Homework Statement
(a) Find energy of incoming beam that creates highest cross section
(b) What are the differences in the two reactions, using quark diagrams?
(c) What would the peaks of the two reactions be like?
Homework EquationsThe Attempt at a Solution
Part(a)
[/B]
Cross section is...
Can resonance occur at multiple frequencies for the same given instrument? For example, in a violin, each note on a given string (say A) resonates and is the loudest only at a specific point on the string. Since each note on the same string can resonate, and each note has a different frequency...
Homework Statement
I have been trying to set up an LRC series circuit where in place of an inductor we have a pair of coupled coils. My aim is to determine the resonant frequency in the circuit when the voltage across the resistor or the current in the circuit is at a maximum. I am using a...
As in what are the conditions for resonance (i.e. in oganic chemistry) to occur? Sometimes it occurs, sometimes it doesn't; for reasons unknown. A little help please? :/:olduhh:
Homework Statement
A resonance filter is a specific second-order digital system designed to attenuate all frequencies except at and
around a given center frequency. The transfer function of a resonance filter is:
H(z)=(1 - r)(1 - rz-2) / (1 - 2rcos(ωcT)z-1+r2z-2)
where ωc = 2πfc, where fc is...
In the reaction :e,p→e,p,η;
(p,η)is called a "baryon resonance",a state of which is "S11(1535)".
(http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.86.1702)
In Particle Data Group,there is an excited nucleon N(1535).Are they the same?
But how could a (p,η)resonce be called excited...
Homework Statement
https://s.yimg.com/hd/answers/i/582779fb3e0b4cecab74f7adb74ed84e_A.png?a=answers&mr=0&x=1422153107&s=7d575e72049bd930d0e263cbd57eff58
The Attempt at a Solution
I have attempted to solve it. But I don't know what I'm doing wrong.
I have only just found out about inductors, and am trying to figure out how a circuit with an inductor and a capacitor could change dc current to ac current.
With the set up of the circuit, would it suffice just to have the dc supply with a 'gate' that stops/allows through the dc current with a...
Homework Statement
Calculate the lower limit of the electron scattering time in a material placed in a magnetic field of 1 T which is necessary to observe cyclotron resonance. The electron effective mass in the material
is 0.06 ##m_o## (where ##m_o## is the free electron mass).Homework...
Homework Statement
http://i.imgur.com/FxuxHjW.png?1
L = 1.6 mH, C = 100 μF. Determine the frequency at which the total current will be 0. (The picture shows 3L, which is 3*L, so 3*1.6 mH.) There's also a hint "Use the vector diagram." The result is 2.5 kHz which I cannot get.
2. Homework...
Arduino DUE based project for testing amplitude-phase response of the sensor or circuitry.
Resonance frequency detection based on zero phase crossing, range up to 250 kHz.
Check it out : https://coolarduino.wordpress.com/2014/12/24/lcq-meter-amplitude-phase-characterizer-piezo-tester/...
This is a concept I have never really understood. I mean to say is how can we include such a thing in a theory? How can we use them if we know that they don't actually exist? Are they some sort of calculation tool?
17:47 - dlbeeson:
Is there any benefit of setting capacitance of an LC tank to resonate an inductor at its natural physical resonance frequency, like a tuning fork frequency? Like a brass pipe hanging on a string in a wind chime, the inductor must also have some physical resonating frequency...
Homework Statement
This is for my differential equation project and this is the last part of the question.
We know that the R=2 and C=0.001. We are given the equation:
Q''+(R/L)Q'+(1/LC)Q=(117/L)sin(120*pi*t)
We want to find the value of L such that we maximize the amplitude of the steady...
Hi guys, this is the first time I post a thread here.
I have a problem that maybe be simple for your guys. If the force as the attached image shows is applied to an object and the frequency of the force equals to the resonant frequency of the object, will resonance happen? If will, will the...
Can someone please explain the significance of resonance levels that forms when electron collides with atoms. How this resonance levels are different from other levels ?
Hi,
Considering a transverse wave on a string fixed at both ends... I understand that a wave summed with its reflection will produce a standing wave at any frequency.
Is it correct that this standing wave is resonating only when that standing wave has nodes at each end?
(Well not necessarily...
Homework Statement
A voltage source is connected to a series LC circuit. The frequency of the source is resonant. The voltage amplitude of capacitor is 1V. Find the average power in the circuit.
Homework EquationsThe Attempt at a Solution
I realize that if there is no active resistance the...
Hi All,
I am glad to have found this site as it offers a great range of information. I have looked through similar threads before posting this and didn’t find anything that answered my questions.
I am to build an induction heater(cooker type) using a half bridge series resonance circuit as a...
Homework Statement
One end of a long pipe is open. The other end is closed by a piston, which can be moved along the pipe, varying its distance from the open end. Although the pipe is filled with air, the speed of sound under the conditions inside is yet to be determined. A speaker near the...
Discharging a capacitor through an inductor creates oscillations. This is about as much as I understand about it. I'm having a hard time explaining my question so I attached a pic.
My questions:
1. In circuit A, are there oscillations in the inductor as the battery charges the first capacitor...
Hi,
I am trying to understand how precisely a voltmeter is used to measure the resonant frequency of a sound wave in a helmholtz resonator. Is it simply that the maximum voltage corresponds to the resonant frequency?
A detailed description or external link would be great.
Many thanks.
Homework Statement
measure the velocity of sound in the air using tuning fork and a pipe closed at one end
method a: End Correction involves applying a correction factor to the first resonant length based on the diameter of the tube used.
method b: Second Resonant Length involves finding two...
I've been reading lately in particle accelerators and electrons and it got me wondering.
How do electrons induce resonance in a cavity resonator? Do they have to first be accelerated to one of the walls of the cavity where they then bounce off toward the other wall?
Hello Physics Forum! I have a question:
The problem: For a lightly damped oscillator being driven near resonance in the steady state, show that the fraction of its energy that is lost per cycle can be approximated by a constant (something like 2pi, which is to be determined) divided by the Q...
Homework Statement
An AC voltmeter connected to the nodes A and B shows the same value as when connected to the nodes A and D (refer to attachment). What is the inductance of the inductor? What value does the voltmeter show? The inductor is ideal. U = 70sin(314t) V, C = 80 μF, R = 500 Ω...
For the molecule HOCOO-, does the oxygen in the OH group participate in resonance? Is that particular contributing structure a major contributor to the hybrid structure?
After a bit of discussion with peers, we agree the oxygen has electron-withdrawign effects, but since it is already bonded...
Good afternoon,
I am working my way through the Feynman lectures and I am stumped at Chapter 23, Resonance. Specifically, the derivation of equation 23.12. I have followed up to that point but the appearance of tan (theta) baffles me. The equation is below:
Any help would be greatly...
Homework Statement
in series rlc circuit maximum voltage across inductor occurs at which frequency?Homework Equations
The Attempt at a Solution
In the series rlc circuit current through the inductor is maximum at the resonance frequency.
But I don't know whether at resonance frequency maximum...
Here attached is a question from my exam. My TA removed 1 point out of 7 for a reason. Can anyone decipher for what? There's the writing in red but it is illegible to me. I don't understand to what he refers by 8 and 6 t or +, or whatever he wrote.
http://imgur.com/igpyp8V
Or can anyone write...
I am doing R&D and have been hit by a problem. I want to find the resonnce frequency to my heating coil without having to hook it up to the rest of my oven. I fall into the problem because I don't have the stray funds to buy a frequency generator. I heard that with capacitors and an oscilloscope...
Please could someone explain to me what is meant by the radially symmetric "breathing resonance" of a sealed water filled tube or cell?
That is with the use of transducers this can be achieved, but what does it mean? is it talking about generating a standing wave in the fluid?
It relates...
Please look at the pictures.
I do not understand why they have not included the resonance structure for that molecule for which all the double bonds are displaced is not included.
Hello all!
Homework Statement
Consider a cylindrical cavity with length "d" and radius "a". Find the corresponding electric field, and the dispersion relation therein.
Homework Equations
Maxwell's equations.
The Attempt at a Solution
I tried to solve the appropriate vector Helmholtz...
Homework Statement
Are the following statements true?
1) All contributing resonance structures must have the same net formal charge.
2) All atoms in contributing resonance structures must have complete octets.
The Attempt at a Solution
The first one strikes me as true. Net formal...
Homework Statement
Is N triple bond O with a radical on oxygen a valid LS for the nitric oxide molecule?
Homework Equations
Max number of valence electrons in a shell - 2n2.
Oxygen is in second row of periodic table. Max valence electrons: 2(2)2 = 8.
The Attempt at a Solution
I...
Homework Statement
A series RLC circuit is driven by an ac source with a phasor voltage Vs = 10∠30◦ V. If the circuit resonates at 103 rad/s and the average power absorbed by the resistor at resonance is 2.5 W, determine the values of R, L, and C, given that Q = 5.
Homework Equations...
Homework Statement
A mass m is attached to one end of a massless spring with a force constant k and an unstretched length l0. The other end of the spring is free to turn about a nail driven into a frictionless, horizontal surface. The mass is made to revolve in a circle with an angular...
Homework Statement
There is a cylindrical vessel of cross-sectional area 20cm^2 and length 1m is initially filled with water to a certain height as shown. There is a very small pinhole of cross-sectional area 0.01cm^2 at the bottom of the cylinder which is initially plugged with a pin cork...
Homework Statement
Following a worked example in my book, I have been trying to get a solution for the equation
\frac{d^2u}{dt^2} + \frac{k}{m}u = Fcos\omega t
The book says that at resonance, i.e. when \omega_0 (the natural frequency) = \omega (the forcing frequency), the term F cos\omega...
So we're studying resonance.
It says that it occurs when an external periodic force acting on a body is exactly equal to the natural frequency of the body. The body then begins to vibrate with greater/increasing amplitude and intensity.
And so what I want to know is that is there a...
Resonance -- How does it occur?
I am having a little difficulty with the concept of resonance. Could someone explain how resonance occurs and how elastic oscillation relates to resonance?
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...