# 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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### Why don't transformers have capacitors?

I recently learnt about how resonance in an LC (inductor capacitor) circuit could increase the efficiency of the circuit, for application in something like Resonant Inductive Power Transfer. Excuse ...
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### Air oscillation at open window of a moving car

When driving a car with an open window one can hear (and feel) oscillations of air at the threshold of the open window. I used to think the open window and the car interior were forming a Helmholtz ...
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### mode-locked laser Repetition Rate

I don't understand how we can produce a laser system with different (lower) repetition rate than the resonant frequency of the cavity? In other words, when we have different resonating modes, then ...
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### The “watering hole” frequency versus microwave oven frequency

I recently learned about the "watering hole," a group of frequencies between 1.42 and 1.66 GHz. I also read that microwave ovens operate at 2.4 GHz. If 21 to 18 cm (1.42 to 1.66 GHz) is the resonant ...
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### Renormalising $\Delta$ baryon mass in chiral effective field theory

I have essentially no experience of quantum field theory, other than a superficial knowledge of some basic ideas - my apologies if I've phrased anything unusually or made any mistakes in my question ...
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### Why do piezoelectric elements have a resonant frequency?

While working with a piezoelectric element, I noticed some high frequency oscillations at 6kHz. I can't figure out why the piezo element has a resonant frequency. This is unlikely to be noise as there ...
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### In mechanical systems, it is easier to understand concept of natural frequency, could somebody explain natural frequency in electronic elements?

In mechanical systems, natural frequency simply means the frequency at which the body will oscillate when it is disturbed(assuming the body will suffer zero resistance in motion) but wihle studying ...
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### Has anyone driven a bell or tuning fork using light?

In principle a metal bell or tuning fork of sufficiently high quality factor could be driven by audio frequency radio waves of sufficient power to produce an audible hum. Has this been done, yet? If ...
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### How do I calculate the resonance frequency of a block of material?

I would like to know how I go about calculating the resonance frequency for an object, given its material properties and dimensions. For example, a small rectangle $X$ by $Y$ by $Z$ dimensions, I ...
The prompt is to find the resonant frequency $f_r$ of a rectangular resonator which is filled with a magnetic material rather than standard air or vacuum. I'm confused as how the resonance frequency ...