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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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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Why does a bottle under pressure resonate better than one at ambient pressure?

Consider a plastic soft drinks bottle. Shake it up so that it fizzes and pressurizes the environment inside the bottle. Tap the side of the bottle, and it'll make a low bing sound. Now open the ...
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What exactly do we mean by 'Free spectral range'?

While reading about Fabry perot interferometers, we conclude that transmission can only happen when twice optical length of the cavity is equal to an integer multiple of the wavelength of the incident ...
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Why does a howling wind's frequency rise and fall with wind speed?

At a friend's home on the top of a hill one can often hear howling winds with the frequency rising and falling in parallel to the strength of the wind's force. When one blows over a mouth of a jug or ...
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What is the relationship between the complex frequecy of a RLC circuit and the half power frequency of it?

First of all, I would like to apologize for possible mistakes in the writing of this text, since English is not my mother tongue and it is my first time in this blog. Secondly, and more important, ...
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What does the phrase “$s$-wave resonance” mean?

I saw the phrase "$s$-wave resonance" in various research articles: "Comparison of average s-wave resonance spacings from proton and neutron resonances" by Vonach H, Uhl M, Strohmaier B, Smith BW, ...
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Can applying a downward force on an orbiting object cause a resonance?

I'm thinking of a system like an object in orbit around a planet. Say a 100kg mass orbiting the earth. If I were to impart 1 m/s to the object down toward the center of the mass it is orbiting, what ...
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Help with obtaining the derivation of the resonance frequency of a bubble [closed]

I have a question with regards to the derivation of the resonance frequency of a bubble described using the bubble dynamics equation in the paper I'm currently reading (Eqn 1): $$\frac{3}{2}R_t^2+RR_{...
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Resonant frequencies in organ pipes

I have a series of doubts regarding the principle of organ pipes. For a given length of closed organ pipe there are various modes of vibration for the standing waves.I dont know if this is silly but ...
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Power in series LCR circuit [closed]

In a series LCR circuit R=200 ohm and the voltage and the frequency of the main supply is 220 V and 50 Hz respectively. On taking out the capacitance from the circuit the current lags behind the ...
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How does the tuned mass damper on Taipei 101 work?

I'm interested in how the tuned mass damper on the top floors of Taipei 101 works, particularly how do engineers ensure that it dampens oscillation rather than making it worse. The damper can be ...
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Current in a resonant circuit using complex impedance

I tried to obtain the current $I(t)$ of the shown resonant circuit using complex impedance. The inductor and capacitor have impedances $i\omega L$ and $\frac{1}{i\omega C}$ respectively. Using ...
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Resonating glasses

When we collide two glasses they produce sound like not from one collision but from multiple. And frequency changes over time. Is this because they resonate with each other? But how this resonase ...
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How is resonance isolated from other parts of a system

I am looking for a qualitative answer, if possible - that is an interpretation of the laws and corresponding mathematics, since neither of these is relevant to my area - but the overall trends/broad ...
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When using $\Delta \omega/\omega _{0}$ as a measure of how sharp a resonance is, why divide by $\omega_0$?

In A.P. French's Vibrations and Waves, page $111$, the author said the following about the sharpness of a given resonance, We can say that the resonance is narrow if the width is only a small ...
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Clothing fibres which would prevent the (vibration / resonance) effect live music has on the body

My 12 yr old cannot bear live music concerts. The bass, i think, hurts her entire body. She tells me she cant breathe, & the pain is a stab sensation in her chest & abdomen. Shes a very lean &...
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Charge neutrality during hole cyclotron resonance measurement

In the '50s '60s '70s, the cyclotron resonance experiments had a golden age. Many by now well-known material (Si, Ge, InSb) was characterized at this time. For cyclotron resonance, it is necessary to ...
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How do the vortices in vortex-induced vibrations (VIV) form?

I am currently doing a research project on the topic of the Vortex Bladeless technology in a technical college course. I have been researching VIV and the intuition behind this, but I am still ...
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Can physical spaces 'resist' certain sound frequencies?

I whistle a lot, and I'm fairly decent at it. Recently I was walking up the stairs in a house while whistling. As I whistled, I found it difficult to hit a specific note in the song that I would ...
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Help in understanding frequency vs phase difference graph

The following graph in my textbook plots the relationship of external driving frequency and phase difference of the driver and a system. From this question (Why dosn't amplitude increase when ...
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Why coupled oscillators tend to seek integer frequency ratios?

In this document, the author writes (page 225) Coupled oscillators have a tendency to seek frequency ratios which can be expressed as rational numbers with small numerators and denominators. For ...
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Thermal Population of a Quantum State with Tunable Frequency

I've been working on understanding tunable LCJJ oscillators (an example paper on such a thing can be found here: https://arxiv.org/abs/0712.0221) and I was wondering if anyone had any input on the ...
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Symmetrical design of a tuning fork [duplicate]

I was reading Ch. 10 of Kleppner and Kolenkow and I came across an explanation which said "The energy loss in a tuning fork is primarily due to heating of the metal. Air friction and energy loss to ...
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What happens if one end of a string is vibrated at a frequency not equal to the harmonic modes?

Let's say we have a string of length $L$ with wave propagation speed $c$. The right end $(x=0)$ is fixed to be at zero amplitude and the left end $(X=-L)$ is vibrated at some angular frequency $\omega$...
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What are part of body receiving such these frequencies so they are claimed can heal? [closed]

Here are what are claimed frequency can be used to heal our (certain part of) body. In my opinion, they work if the "transmitting" frequencies are meet with the receiving frequency in our body. I have ...
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Why is Microwaved mac & cheese burnt where they touch?

After reheating cold about 1.5 oz. of Annie's Mac & Cheese shells for 15 seconds on high power in the microwave, the mac & cheese was burnt black only at certain points where the pasta is ...
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Standing Wave in a transmission line and Resonance

let's consider a transmission line of length L closed on a mismatched load. So, there will be a travelling wave and a reverse travelling wave: V(z) = V+(z) + V-(z) My question is: will there always ...
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Derivation of driven force on a string. How to prove maximum amplitud is achieved at resonant frequency?

I know if I have a driven oscillator of natural frequency $\omega$, applying a driven force $F_0 \cos (\Omega t)$ will result in a motion equation like this one (steady state/particular solution): \...

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