Resonance Definition and 659 Threads

I want to build a Resonant Cavity to play with frequencies around 100-700 mhz. I'd like to try different shapes, so I was thinking in using a cheap malleable material like aluminum foil. Questions: - I think one layer of aluminum foil might be too thin.. If I paste a couple of layers will do...

Homework Statement 2. Consider an electric circuit consisting of an inductor with inductance L Henrys, a resistor with resistance R Ohms and a capacitor with capacitance C Farads, connected in series with a voltage source of V Volts. The charge q(t) Coulombs on the capacitor at time t ≥ 0...

Why does the total supply current increase when the capacitance value is further increased after parallel resonance is reached (where the supply current is minimum) ? I know it has to do with the phase angles but I cannot reason it out. Thanks

Homework Statement calculate R2, so the resonance is still posible ? C = 40 μF R1 = 30 ohm L = 9mH image : http://postimg.org/image/kampvczv5/ Homework Equations ω = 1/sqroot(L*C) c = 1/(ω*C) XL = ω * L Z = (Z1*Z2)/(Z1+Z2)The Attempt at a Solution My approach was to first calculate the...

Homework Statement On June 10, 2000, the Millennium Bridge, a new footbridge over the River Thames in London, England, was opened to the public. However, after only two days, it had to be closed to traffic for safety reasons. On the opening day, in fact, so many people were crossing it at the...

Since the resonant frequency of a tank circuit, is completely adjustable, and controlled by the value inductor and capacitor you use, I was wondering if it had any other uses, other than increasing its impedance at its resonant frequency. Can if be used to produce ac signals of its resonant...

Beam standard atomic clocks work by changing the magnetic state of a cesium atom by applying a microwave frequency that matches the resonant frequency of a cesium atom. What is this resonant frequency of the atom in terms of actual events that occur on the atomic level...

Homework Statement Question 1: When analysing AP French's Formula for Frequency of Wine glasses, what is the direct relationship between the Frequency heard (at different levels - fd) and the level of water from the top of the glass (d). I know that as the level of water from the glass...

Homework Statement My group and i need to do an experiment for school. We decided to investigate the effect of water level in a vine glass (or volume) on the resonance frequency. Basically does the resonance frequency change when you change add water to the glass. I would just like some help...

Hi, I am just confused, regarding some definition above, I hope anybody can help explain differences. Does atoms resonate when subjected to some wave?

A person is swimming underwater and his ear canal of length L=5 cm is filled with water. It can be treated as a column of fluid open at one and closed at the other(eardrum). Velocity of in water is 1500 m/s, at what frequency will his ear be most sensetive due to resonance in his ear canal?

Please explain Nuclear Magnetic resonance and how it is applied to other fields? I know it has to do with magnetic field around atoms and stuff like spectroscopy and imaging. But please correct me and please go in dept with Nuclear magnetic resonance.

Hi, The book I'm following says that resonance depends a lot on the "delocalisation of charge". What does "delocalisation of charge" mean and how do I determine it? Does it mean the number of pi electrons? Thanks in advance!

What´s the difference between a resonance and a virtual state? For comparison, a standard moderately lived state, hydrogen 2p state, has energy of 10,2 eV above ground, and width 4*10ˇ-7 eV. An example of resonance is Delta - with mass 1232 MeV, it´s energy is about 290 MeV above ground...

Hi! I wondering does anyone here has a clue of lowering the absorption level and narrowing the scattering bandwidth of LSPR of nanoparticles? Are those "intrinsic" properties or can be improved by modifying their size, shapes, etc? Thanks for sharing your thoughts! Paul

[Moderator's Note: This discussion was split off from another thread: https://www.physicsforums.com/threads/expunging-myths-from-the-classrooom.849853/] Well, engineering is not my field, so as a layman, I'm having trouble reading the nuanced difference between resonance and flutter. The Tacoma...

I find most textbook explanations of resonance lacking. My understanding is that resonance occurs becuase less "driving energy" is lost when the driven frequency approaches the natural frequency of a system. But why does the energy loss curve like this? Since Q-factor is different for each...

Hello, I have recently picked up drumming and the topic of tuning has peaked my interest. I have gone over numerous sources (academic theses, Wikipedia, HyperPhysics, etc.) trying to piece together what is occurring when drums (right now tom with two heads, batter and resonant, are of most...

the carbon in benzene is sp2 hybridized and the p orbital is involved in double bond.sp2 orbitals and p orbitals are perpendicular to each other,for any electronic transition between orbitals,the orbitals should not be perpendicular.so how does pi electron go to carbon's orbital?

Alright. I have also a few questions concerning dipol-antennas: first: It has often been said, that the dipol antenna, in order to receive a certain frequency, needs to have a length of λ/2. I don't see a clear reason for that. If one would not know that, one had to calculate the Capacity...

The Transverse resonance method is used to determine the propagation constant of a wave in several waveguides, like the rectangular waveguide, or also dielectric waveguides. It takes advantage of the fact that a standing wave is present along a certain direction (transverse with respect to the...

I read that vinyl or aryl carbocations do not have resonance stabilization but I can't understand why that is the case. Below I have drawn some resonance structures for aryl and vinyl carbocations: Aryl carbocation: https://imgur.com/QwiHJg8 Vinyl carbocation: https://imgur.com/rKBs57d In both...

I am interested to know what governs whether an object in the path of a sound wave will feel force. For instance will low frequency sound have more of an effect than high frequency? What difference does the material or shape of the object have on whether it would feel any force from the...

Homework Statement See the picture. If at electrical resonance ##U_c=60 V## and ##U_L=40 V##, find the ratio of reactances ##\frac{X_L}{X_c}##.Homework Equations [/B]##Z=\sqrt{R^2+(\omega L - \frac{1}{\omega C})^2}## , ## Y= \sqrt{\frac{1}{R^2} + (\omega C - \frac{1}{\omega L})^2}## , ##\phi =...

I'm studying from landau lifšits "mechanics". I had some troubles in section small oscillations-->forced oscillations, especially from eq 22.4 to eq 22.5 i searched the web and came across this: https://www.physicsforums.com/threads/forced-oscillations-and-ressonance.488538/#post-3236442 this...

(I'm new to the Forum, so if I violate the rules unknowingly, please do let me know) So, during a recent research, I analyzed the frequency spectrum of our hand's oscillation while walking. As it turns out, it contains distinct harmonic frequencies (around 1.8*n Hz), and the second among them...

For a spring and mass system, I've learned the resonance frequency of a system increases with decrease in mass. Not sure if this case is also related but when I attach a coin sized metal onto a piezoelectric material of a smaller size, the resonance frequency range actually goes up (from...

From the resonance structures of Naphthalene, 1-2 Bond has more double Bond character than 2-3 Bond. In March's Advanced organic chemistry, its given that ozone preferentially reacts with 1-2 Bond. But the reaction is not given. Is this a normal ozonolysis reaction in which the 1-2 Bond is...

Hello Peeps~ I have couple of questions related to vibration and I would really appreciate some help from you experts out there. Anyways, say I have a metal plate with mode shapes observed at 100 Hz and 300 Hz as shown in the below figures. If I were to chip(cut) off a small part of the...

Homework Statement This is a problem with Sappling involved. I was given a Lewis Structure, told it was an anion (no charges were given just that it was one) and told to fix the structure and draw a resonance. Homework Equations No Equations. The Attempt at a Solution The problem starts out...

A string that is 6m long is vibrating with 3 loops in it. The frequency of the source is 16.5Hz. What is the fundamental frequency of the string? For the life of me I can't figure out how to solve this question. I found out that the wavelength is 4.8m but that's about it. If I use the equation...

I was talking to a friend recently and he said something to me that i just didn't understand. He is a physicist and i most certainly am not. I was telling him about similarities that i had observed between two things and was not sure if it was a coincidence or if there was a tangible link...

I recorded the sound spectra of a singing wineglass (rubbed the rim with a wet finger) and a pinging wineglass (tapped anywhere at its wall) with a smartphone. Evidently the fundamental tones of both vibrations are identical, but the overtones are very different (harmonic vs. anharmonic). As the...

Homework Statement The graph (see image in part 3) illustrates how the amplitude of a car's vertical oscilltions vary withthe frequency of an oscillating surface. I was asked to state the amplitude of the oscillation of the surface. I was told It stayed constant. Homework Equations Nil The...

1. a source of sound is directed a large brick wall. a girl walks towards the wall and notices that the intensity of the sound decreases to aminimum every 50cm. what is the frequency of the sound? the air temperature is 20 degrees celsius (answer is 344Hz)2. attempted to use the universal wave...

Homework Statement Which of the following situations is a result of resonance? a. Hydro wires "hum" as a mild breeze blows over them. b.A child pushes herself on a swing by moving her legs back and forth appropriately. c.Windows in your house rattle as a large truck drives by. d. Building...

What exactly is resonance? I have bean reading some literature and I do not understand what precisely it is saying. But since that is very unspecific question, I will to ask some question that are puzzling me, to try to show more specific what I do not understand. 1. What exactly can resonate...

Hi All, I have a question about resonance cross sections. I have been doing the design work on the reactor I want to propose for testing at Oak Ridge National Labs, and have run into a problem. It is an accelerator driven reactor transmuting thorium into uranium, then burning the uranium by...

Hi pf, Please could someone kindly answer a few questions about proton spin in the context of MRI. As I understand it when an external static magnetic field is applied to a patient the magnetic dipole moments of the protons in the hydrogen nuclei will experience a torque causing them to align...

What causes resonance? Why does a vibrating object only cause another object to vibrate of the two objects have the same natural frequency?

Homework Statement The question says that: Calculate the resonance energy for CO2 from the following ΔH(C=O)=339 kJ/mol ΔH(O=O)=498kJ/mol ΔH(C(s)→C(g))=718kJ/mol ΔHcombustion (carbon)=-393kJ/mol. Homework Equations none The Attempt at a Solution I am completely unable to understand how will...

This is not a homework question per se, but rather something I have come across during a homework project. Using Audacity, I recorded a few different instruments playing the same notes (investigating timbre). I noticed that (using a steel string acoustic guitar) the first harmonic at 131 Hz...

I'm obviously studying about neutrinos lately... So, I wanted to ask about the Glashow resonance. I don't understand what they mean when saying: http://arxiv.org/pdf/1108.3163v2.pdf (sec.2) Unfortunately I don't have access in the refs. If I understand this correctly, it says that the...

Hi everyone...I'm just looking nmr schemes, and magnets, and, at the same time, studying Physics II and electromagnetic fields at my faculty of electronics engineering. I know this may sound like a "dumb" question, and I don't want to sound like councited or similar stuff, but I was just asking...

Question: The Breit-Wigner cross-section for a resonance R is ## \sigma_{i \to f} =12\pi\frac{\Gamma_{R\to i} \Gamma_{R\to f}}{(s-M^{2})^{2}+M^{2}_{R}\Gamma^{2}_{R total}}## [1], where ##s## is the com energy squared, ##M_{R}## is the mass of the resonance , ##\Gamma_{R total}## is the total...

I am having trouble making sense of the frequency of oscillations for a cyclotron. What I don't understand is, if a the voltage difference of the two dees is switched twice ( each time the particles are about to enter them), then why is the frequency of oscillation the same as the frequency at...

Hi! I have a few questions about resonance: 1) What exactly is the "amplitude of driver of oscillation"? And why is the amplitude of the driven object equal to the amplitude of the driver right from the start when the driver frequency is 0? 2) Is the driven system originally oscillating? 3)...

Ｉ Want to analyze the decay from a excited nucleon to a nucleon and an Omega meson.I have seen a propagator which descripes a process : a→b+c (Eur. Phys. J. A16, 537–547 (2003), Covariant tensor formalism for partial-wave analyses ofψdecay to mesons ,B.S. Zou and...

What I mean to say is that why are some substituent groups such that(during resonance) the pi electrons' delocalisation is directed away from it while some groups are such that delocalisation of pi electrons is towards those groups? Can you kindly give some examples too?

And what are the conditions for resonance to take place?