Questions tagged [resonance]

Resonance is a characteristic of physical systems having a structure that allows energy to flow between various states at a specific, oscillatory rate (resonant frequency). For a stable resonant system at steady state the internal energy is either fixed without losses or the rate of energy input is equal to the energy losses.

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Bandwidth of a RLC Circuit

Bandwidth of an RLC circuit is defined as the angular frequency difference for which Power dissipated through circuit is half of that dissipated at resonance. What is so special about this range that ...
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How to calculate properties of a coupled electromagnetic / mechanical oscillator?

I'd like to study a class of systems which are (essentially) coupled electromagnetic/acoustic oscillators which can act as antennas for an electromagnetic field, but also can vibrate mechanically with ...
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How do I describe the following system? [closed]

So the professor of my physics 3 class assigned this problem regarding forced oscillations. A mass of 0.30kg hangs of a massless rope. The center of oscillation can move as shown in the figure. When ...
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Analytically understanding wireless power transfer

https://youtu.be/M8aZoM9p43k This YouTube link shows a experiment I quickly made. Two resonant lc circuits that use magnetic fields to wirelessly light up a led. I manually found the best frequency ...
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Resonance and standing waves on a bar [closed]

I'm having trouble solving this problem: By applying a harmonic force, acting on the end of a free bar of length $L$, a standing wave is formed due to multiple reflections: Where are the nodes of ...
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How would I go about finding the resonant frequency of a glass pane?

I've done some research, and found some videos and articles on how I could find the resonant frequency of normal objects - By hitting them, and then finding the frequency using a software. But the ...
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Frequency of human body - EM vs vibrational?

Apologies for the noob question. I have seen people calculate the wavelength of the human body based on weins law as follows: 0.002898/310 = 0.00000934838 m ...
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Detection of resonance particles

why we detect an increment in the number of events of the reactions for the energy of resonance particles? I read that cross section of this new unstable particle must be added to the cross section of ...
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Fabry-Perot Finesse vs Ring Resonator

Why is the finesse of a fabry-perot resonator given by $2\pi/\text{RTL}$ while the finesse of a ring resonator is given by $\pi/\text{RTL}$? The finesse of a fabry-perot resonator is given by $F = 2\...
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Why does mass-spring system tend or prefer to oscillate with natural frequency? Can you explain it theoretically rather the derived version of it? [closed]

Why the mass spring system prefers to oscillate at natural frequency, why does it rather oscillate at other frequencies? Every object in the universe is always vibrating, is it true? if it is the ...
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The notion of TEM, TE and TM modes in an arbitrarily shaped cavity

In order to define the usual modes of EM waves in a confined space, TEM, TE and TM, one must have a well defined notion of "transverse" and "longitudinal" in the system. In the ...
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Free Spectral Range versus Axial Mode Spacing?

I am doing research on micro cavity frequency combs and I've been trying to understand things like dispersion, Free Spectral range, resonance, and modes. I am looking at the definition of free ...
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Resonance frequency with metal

I've made an experiment with resonance frequency of a LC circuit. One part was to place a metal (I think iron) in the middle of the induktivity of LC circuit. I measured a higher resonance frequncy as ...
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Quality factor definition

During my study of oscillators I have encountered two different ways do define the Quality factor $Q$, which gives information about the amount of damping on a system. Suppose the oscillator equation ...
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What is the meaning of a non-resonant neutrino production?

What is the meaning of non-resonant production in the following context: They assumed a negligible primordial lepton number,or asymmetry, so the neutrinos are produced non-resonantly. [1] I thought ...
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Higher and lower frequencies than resonance frequency in an RLC circuit [closed]

I read in my high-school book that in a RLC circuit for frequencies lower than $f_{res}$, $X_C>X_L$ and for higher frequencies $X_L>X_C$, where $X_C$ is the resistance of a capacitor and $X_L$ ...
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Pressure dependency of the end node correction in a double-ended resonator

I have an acoustic resonator which is tube-shaped and open on both sides. The open ends of the tube open into a buffer volume. In the picture below I visualized my assumption. Measuring the resonance ...
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Why do standing waves filter out all other frequencies but its natural frequencies

I was wondering about how standing waves filter out all other frequencies. I read online that it's because the other frequencies destructively interfere with one another. However as hard as I try, I ...
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How do I show that as the mass ratio in a pendulum tuned mass damper system increases, the effect of damping increases?

A pendulum tuned mass damper installed on a building acts as a ‘counteragent’ during building excitation, absorbing some of the kinetic energy (K1 and K2) produced and thus mitigating the amplitude of ...
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Equivalent lumped element model of an inhomogenous distributed transmission line

Good day, I'm interested in an equivalent-circuit type problem that might be closely related to this question and its answer. What I am considering is sketched below: Essentially what I meant to ...
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Schumann resonance frequency

I keep hearing that Schumann resonances have been increasing rapidly in recent years. And that it was relatively stable before. I failed to find any scientific data proving or disproving this. I would ...
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How loud really are ultrasound transducers?

There are a plethora of mini ultrasound transducers available. Many of which have a Sound Level SPL > 110dB. This seems extremely "loud". If you were to listen to one of these transducers, would they ...
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Does resonance by sound waves, or by any other similar means, occur at the molecular level?

When the frequency of sound waves match the resonant frequency of a structure, like a building or a window, resonance occurs which is clearly visible. This frequency depends upon the material and it's ...
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Is it possible to probe the molecular vibration of diatomic molecules without a dipole moment by some way?

I was reading about the vibration frequencies of molecules, and I realised molecules like iodine (diatomic) have only 1 vibrational mode, and the vibrations are too weak to be probed. Is it possible ...
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Quality factor of earth's rotation around sun

I am taking a course on the resonance phenomena, and the professor was mentioning something like, the earth's rotation around the sun has a quality factor of $10^7$. Does it mean, after $10^7$ years, ...
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Effect of initial shift on undamped forced oscillation

I have general equation for undamped forced oscillations (no friction) which is: $$x(t)\ =\ \frac{v_0}{\omega_n}\cdot \text {sin}\left( \omega_n \cdot t \right)+\left(x_0\ -\ \frac {f_0}{\omega_n^2-...
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How does the resonant frequency of a glass slab depend on its thickness

I am interested in finding out how does the thickness of a glass slab change the resonant frequency of it. Since i know that resonant frequency not only depends on the material but also on the ...
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Predict the behaviour of this system involving magnets oscillating on springs through connected coils

I came across an interesting problem recently and started to think about the situation in more detail. Here is the setup: Identical bar magnets are suspended from identical springs, with the North ...
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Question regarding open and closed air columns

I'm studying high school physics and I've encountered this question: An air column that is open at both ends has a distance of 24.0 cm from one resonant length to another. What is the wavelength ...
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Why does “AT cut” of Quartz provide pure shear thickness oscillation?

According to this page https://www.nanoscience.com/techniques/quartz-crystal-microbalance/, “AT cut” provides pure thickness shear mode oscillation where the two surfaces of the crystal move in ...
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Has anyone tried to find the wavelength to the Corona virus cell? [closed]

I have seen websites and videos that show how cancer cells can be destroyed using sound resonance oscillation. So has anyone heard of anyone who is in the field of sound resonance trying to capture ...
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Resonant and non-resonant terms in $RLC$ cirquit

I have tried to solve a differentials equations of a RLC circuit. In the the solution I have terms proportional to $e^{iw_0t}$ and $e^{-iw_0t}$, where $w_0= \sqrt{1/LC}$. The author proposes in the ...
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Förster Theory donor and acceptor spectrum

Why is the absorption spectrum of the acceptor by a lower frequency compared to the emission spectrum of the donor? I expect the the absorption spectrum to be within the same frequency range as that ...
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Cantilever Beam Deflection with load in middle of beam

How can I calculate the deflection of a Cantilever beam if there is a load at different points on the beam? My current scenario is the following → I have a ruler that I have modelled to be cantilever ...
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Cantilever beam with a mass at different positions and resonance frequency [duplicate]

I have a Cantilever beam attached to vibration generator at the bottom. I have a piece of blu tac of some mass and I move it down the ruler. Whilst moving it down I notice the resonance frequency of ...
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2-body resonances study resources [duplicate]

As a part of my Particle Physics Course, I will need to give a talk on 2-body resonances - What are they? Some examples like $J(\Psi)$, Z boson and significance of those discoveries. I am looking for ...
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Pendulum Mass Dampers and Buildings

So if a driving force is applied to a building containing a mass damper, what will happen under the following circumstance If the mass dampers frequency is not equal to the resonance frequency of the ...
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Can a resonance plot be upside down, i.e., inverted?

Given the following RLC circuit with an AC driving source, $\hskip3in$ I have found an expression for the amplitude to be $$ I(t) = \left(\frac{V_{0}}{R}\right)\frac{(\omega \tau)}{\sqrt{(\omega\...
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How do materials absorb light?

I've seen a lot of different different answers online so I just want a clarification. Electrons can absorb photons in 2 ways. The first way involves the electron cloud oscillating with the photon but ...
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Can the first harmonic not be resonated?

I'm confused by the following excercise: A violin string is put next to a speaker. The speaker goes through all the frequencies between 50Hz and 1500Hz. It is observed that the string only ...
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Understanding a resonance experiment

This article states that If an object is being forced to vibrate at its natural frequency, resonance will occur I can understand how this definition applies to a playground swing: if person A ...
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How does tea kettle whistle?

Apparently no one fully understood the phenomenon until 2013 https://www.cam.ac.uk/research/news/how-the-kettle-got-its-whistle How I interpret what the article said was the steam goes through a ...
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Why does pitch increase when you blow harder into a whistle?

When you play recorder or whistle, the pitch depends on how hard you blow into the tube. E.g. when you blow a whistle, initially the pitch is slightly lower when there is less air flow. This seems ...
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How do cavity resonators differ from tubes of uniform width?

I read that wine bottle produces sound when u blow sideways onto its rim because some frequencies of the white noise produced in your mouth gets amplified when they match the natural frequency of the ...
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Helmholtz resonance

I conducted my own Helmholtz resonance experiment with a glass voss bottle. The graph I obtained when plotting my experimental values of f against the reciprocal of square root V is plotted on the ...
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Understanding how the amount of water affects frequency emitted by wine glass

I've looked across the internet for an answer to why changing the water level in a wineglass affects the frequency measured when the rim of the glass is rubbed. Here's what I've found so far: Adding ...
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Resonance Frequency and Centre of Gravity

Is there a relationship between these 2 As of now I am moving a piece blutac up and down a ruler to change my COG. I have connected the base of my ruler to a vibration generator and am measuring the ...
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Forced Oscillations: What exactly is happening? [duplicate]

In a forced oscillation, what exactly is happening? My textbook says that: The oscillator, initially, oscillates with the natural frequency. When we apply external periodic force, the oscillation with ...
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Dependence of resonant frequency on the length of a ruler

Why does the resonance frequency of a ruler increase when the length is lower? I have a relationship from experimenting but I want to know why. I have a vibration generator hooked up to the bottom ...
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What is the relation between the fundamental frequency and a harmonic?

I am currently busy with a physics report about determining the speed of sound in air. In order to do this, I was told to use a tube that can extend or shorten in order to find the different harmonics ...

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