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What are the methods for the production of ultrasonics?
Ultrasonics are sound waves with frequencies above 20khz. GALTON WHISTLE First they were produced by Galton.He called his Instrument the galton whistle.It consisted of a brass tube 2 mm in diameter and it was operated by blowing in a jet of high pressure gas.it consisted of a piston.on moving it the resonant cavity's length varied,on varying the length the resonant frequency too varied.Thus the resonant frequency depends on the length of the tube/pipe.But this could produce only up to 30khz. MAGNETOSTRICTION METHOD the main principle for this method is when a ferromagnetic rod made of material like iron or nickel is subjected to alternating magnetic field applied parallel to the rod,there will be a small elongation or contraction in its length.this change in length is proportional to the intensity of the magnetic field and nature of the ferromagnetic material. so the length of the rod changes for each half cycle of the alternating current which means the frequency will be twice the frequency of alternating current.. when the natural frequency of the rod matches with the frequency of the alternating current resonance occurs and amplitude will be maximum and ultrasonic waves are produced.In this method frequencies up-to 300KHZ can be produced. PIEZOELECTRIC OSCILLATOR The main principle of this is the inverse piezoelectric effect..according to the piezoelectric effect,when one pair of opposite faces of a crystal like quartz is subjected to pressure the other pair of opposite faces will develop electric charges and if the pressure is replaced by tension then the charges will be reversed..the inverse of this effect is that if the pair of opposite faces are subjected to alternating voltages then the other pair of opposite faces varies in its dimensions,i.e. it expands or contracts periodically thus generating elastic waves.When the natural frequency of the crystal matches with the frequency of the alternating current,resonance occurs and ultrasonic waves are produced.In this method frequencies upto 500MHZ can be produced.
What is the resonant frequency of silver?
Hi there, am reasearching colloidal/ionic silver and am actually investigating what this frequency is myself. This is the only mention sofar, will post more when I find something noteworty. Commercial silver product site http://www.guardian-silver-health-supplements.com/guardian-silver-supplement/ More specifically, Professor Rustum Roy of Penn State University engineered a specific size of the Guardian Silver elemental silver particle that resonates at 890 to 910 terahertz-the same frequency as blue germicidal lights used in hospitals for disinfection. The silver nano particle emits a specific magnetic resonance-890-910 terahertz-which is selectively destructive to pathogens. /Tommi
Is aluminum a combination of two or more metals?
No, aluminum is an element.
What is the white powder that forms on the surface of aluminum when it corrodes?
Aluminum oxide - Al2O3.
The amount of frequency shift during modulation is called?
Frequency shift keying in digital communication and Frequency modulation in analog communication..........
What happens in a circuit at resonant frequency?
what is resonant frequency
What do you mean by resonant in power electronics?
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.
What is the difference between resonance and resonant frequency?
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
The frequency at which an object normally vibrates?
resonant frequency
The frequency that an object wants to vibrate at?
Its resonant frequency.
At a frequency below the resonant frequency parallel circuit is?
A parallel resonant circuit has low impedance, when non resonant; however the impedance rises sharply, as the circuit comes to resonance.
What is the Resonant frequency of a piezoelectric transducer?
It's peak frequency
Do resonant frequency and natural frequency have the same meaning?
Yes.
How do you decrease resonant frequency of a series-tuned circuit?
To decrease the resonant frequency of any tuned circuit, increase the inductance and/or increase the capacitance.
What is it called when the frequency of sound source matches the natural frequency of a receiver?
That is the resonant frequency.
Resonant frequencies higher than the lowest resonant frequency of a standing wave is called?
harmonics
Why does the resonant frequency have to be equal to the natural frequency of the system so the resonant can happen?
Let's say that that's what resonance is all about. Anyway, it need not be exactly the same frequency; just close enough.
