I don't think a "resonant frequency" makes much sense for the Universe. Even a single vibration would never be able to get back and forth, even if it's only through the OBSERVABLE Universe.
at how many atmospheres?
Lots of mass (very low resonant frequency) Low stiffness (very high co-incident frequency) All materials have both a resonant and co-incident frequency, at which sound is transmitted more efficiently. Materials where these frequencies occur outside of the range of hearing (20 - 20,000 Hz) are better for sound proofing. With lead, the resonant frequency is below 20Hz and the co-incident frequency is about 20,000Hz.
No they are independent of each other.
A resonator is a circuit that responds to a narrow range of frequencies. A typical resonator is a tuned circuit containing an inductor and a capacitor in series or parallel. A series connected tuned circuit has zero impedance at the resonant frequency, while a parallel tuned circuit has infinite impedance at the resonant frequency. The resonant frequency in both cases depends on the inductance times the capacitance: F = 1 / (2.pi.sqrt(LC)) If the inductance is in Henrys and the capacitance in Farads, the answer is in Hz.
If resonance is related to hardness (and it is) then the most resonant metal would be Beryllium.
In physics the term harmonics is usually used. Note that the lowest-frequency mode also counts as a harmonic: it is simply the first one.
what is resonant frequency
Resonant in electronics circuit refer to tuning if the resonant condition arise it means the frequency where does the resonant arise is resonant frequency and the gain is highest on that particular frequency. it is widely used in receiver circuits.
resonance is the behavior of resonant frequency while resonant frequency is the cause of it. There are basically two types of resonance; Electrical and Magnetic. Resonant frequency is that particular frequency for a system for which the system performs its best. while the system at that particular situation can be called the system at resonance
resonant frequency
Its resonant frequency.
A parallel resonant circuit has low impedance, when non resonant; however the impedance rises sharply, as the circuit comes to resonance.
It's peak frequency
Yes.
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The fundamental = 1st harmonic is not an overtone!Fundamental frequency = 1st harmonic.2nd harmonic = 1st overtone.3rd harmonic = 2nd overtone.4th harmonic = 3rd overtone.5th harmonic = 4th overtone.6th harmonic = 5th overtone.Look at the link: "Calculations of Harmonics from Fundamental Frequency".
To decrease the resonant frequency of any tuned circuit, increase the inductance and/or increase the capacitance.