# 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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### Relation between initial current and current amplitude in $RLC$ circuits

Let $\phi$ be the so called phase-angle, which measures how much the voltage $V(t)$ leads the current $i(t)$ in a $RLC$ circuit. How would you justify the relation $$i(t=0)=i_m\cos\phi$$ where $i_m$ ...
3answers
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### Can an object keep changing its Resonant Frequency?

I was studying Acoustic Resonance and Resonant Frequencies and learned a lot ... but I have a question which probably the web doesn't seem to answer! Can an object(any object)keep changing its ...
4answers
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### What is a linear system?

I was reading about Resonant Frequency, and found a lot of information about it: like its uses in daily lives, for eg: swing, pendulum. etc I also read about its advantages and disadvantages but the ...
1answer
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### Why do incandescent lights ring before burning out?

Sometimes when an incandescent light bulb is just about to burn out, the tungsten filament begins ringing. What causes this? For people who unfamilar with this effect, what happens is that every once ...
2answers
36 views

### School investigation: How does the size of a resonance box affect the sustain of a guitar string?

TL;DR for a lab report, how does the volume of a resonance chamber underneath the guitar string affect its sustain i.e. time it stays above a volume threshold x. Is there an equation to model this ...
0answers
18 views

### Pendulum Tuned Mass Damper - Mathematical Relationship between Mass and Damping Ratio

I am doing an experiment where I built a test tower with a pendulum to act as a tuned mass damper, similar to this picture below: I want my independent variable to be the mass of the pendulum (which ...
1answer
40 views

### The resonance frequency of a steel ball

I wanted to find the resonance frequency of a steel ball. I assume that gradient disappears on the surface of a ball. I knew that I can find it solving 3D wave equation in spherical coordinates. Due ...
0answers
30 views

### What would sand on a Chladni plate look like with a complex wave?

I'm doing a demonstration for students using a Chladni plate. My setup is similar to this one, https://www.youtube.com/watch?v=1yaqUI4b974 consisting of a single frequency-generator attached to an ...
0answers
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### Acoustic resonance in pipe

This is quite a quick question. Would you call the acoustic resonance generated in pipes with a speaker to be caused by the pipe itself, or the speaker?
1answer
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### Can diffraction phenomenon (e.g. from grating) be viewed as a resonance phenomenon?

In resonance, we deal with oscillation in time. And we require the driven frequency $\omega$ equal to the natural frequency $\omega_0$. Then every cycle the driven force is in-phase with the velocity ...
0answers
15 views

### How can I track the resonance of a tuning fork through a PLL if my phase lag graph is discontinuous?

I am programming a phase-locked loop to track the resonance of a tuning fork so that the tuning fork is always on resonance. This will be used in condensed matter physics through atomic force ...
1answer
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### How to show that at resonance a damped mass-spring system gains no energy?

I am having trouble understanding the topic of resonance in vibrations. For a simple spring-mass-damper system, I need to calculate the energy from the drive function and compare it with the energy ...
1answer
30 views

### What are typical resonant frequency ranges of large crystals?

I want to measure the resonant frequency of a crystal about 1 inch long using a transducer and a contact mic. What frequency ranges should I select to be able to measure a variety of different ...
3answers
556 views

### Forced Oscillation Explained with Violin String

In this lecture on Forced Oscillations, Normal Modes, Resonances, Musical Instruments, the professor says that by moving a bow over a violin string, you expose it to a lot of frequencies. Is there a ...
9answers
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### Intuitively, what actually is the cause of resonance?

Please don't explain it mathematically. I have been searching for the reason for a long time. I have watched Walter Lewin's video giving an example of resonance, but I didn't get the reason behind the ...
3answers
532 views

### Why does resonance occur at only standing wave frequencies in a fixed string?

I could not understand why only certain discrete frequencies are allowed in a fixed-ended string. How does the string behave if we excite it with frequencies other than resonant frequencies?