[permalink] [id link]
The frequency of these oscillations lies in the ultraviolet range for most metals, but it falls into the visible range for gold due to subtle relativistic effects that affect the orbitals around gold atoms.
from
Wikipedia
Some Related Sentences
frequency and these
The frequency used for these experiments is 15 mc. and the transducer is a specially cut crystal with an epoxy lens capable of providing beam diameters smaller than one millimeter.
When now we count the frequency of the 71 items in the two language families appearing in the same column or grade, or one column or grade apart, or two or three or four, we find these differences: Af
What does it mean to be creative, a term we hear with increasing frequency these days??
The square root of the frequency of these photons ( x-rays ) increased from one target to the next in a linear fashion.
Substitution of these expressions into the governing equations in cylindrical coordinates gives us the fixed frequency form of the conservation of momentum
There is speculation as to whether this condition may occur with greater frequency in the general, untreated population ; successful social function of these potentially high-achieving individuals may lead to being labeled as normal, rather than as individuals suffering any substantial dysregulation.
Selective serotonin reuptake inhibitors are likely to be the best choice of pharmacotherapy for many patients with panic disorder, but benzodiazepines are also often used, and some studies suggest that these medications are still used with greater frequency than the SSRIs.
CPUs designed for high-performance markets might require custom designs for each of these items to achieve frequency, power-dissipation, and chip-area goals.
It is characterized by the representation of discrete time, discrete frequency, or other discrete domain signals by a sequence of numbers or symbols and the processing of these signals.
For these thermal effects, the frequency of the radiation is important only as it affects radiation penetration into the organism ( for example microwaves penetrate better than infrared ).
Using transforms it is possible to convert these continuous time frequency responses to ones that are implemented in discrete time, for use in digital IIR filters.
The studies noted that it would be impossible to assume conclusively the likely protective effect of the " other sex acts " including oral sex, or that the correlation between these sexual practices was due to the presence of collinearity induced by some other protective factor not noted in the studies: for example, greater overall frequency of sex.
Examples of FTL proposals are changing the " frequency " of mass to a higher state by applying high-frequency waves of energy, the Alcubierre drive, and the traversable wormhole, although the physical plausibility of some of these solutions is uncertain.
A sufficient condition for recovering s ( t ) ( and therefore S ( ƒ )) from just these samples is that the non-zero portion of s ( t ) be confined to a known interval of duration P, which is the frequency domain dual of the Nyquist – Shannon sampling theorem.
Light sent down into a gravity well is blueshifted, whereas light sent in the opposite direction ( i. e., climbing out of the gravity well ) is redshifted ; collectively, these two effects are known as the gravitational frequency shift.
: For both of these processes, the energy loss per cycle of alternating current is constant, so core losses increase linearly with frequency.
Using inputs such as input voltage, output voltage, output current, frequency, ambient temperature, and inductance these calculators can predict the losses of the inductors core and AC / DC based on the operating condition of the circuit being used.
At the most basic level, initial ratemaking involves looking at the frequency and severity of insured perils and the expected average payout resulting from these perils.
The powerful emissions of these devices can create electromagnetic interference and disrupt radio communication using the same frequency, so these devices were limited to certain bands of frequencies.
Many of these lasers actually lase in several longitudinal modes at the same time, and beats between the slightly different optical frequencies of those oscillations will in fact produce amplitude variations on time scales shorter than the round-trip time ( the reciprocal of the frequency spacing between modes ), typically a few nanoseconds or less.
In most cases these lasers are still termed " continuous wave " as their output power is steady when averaged over any longer time periods, with the very high frequency power variations having little or no impact in the intended application.
Any of these properties can be modified in accordance with a low frequency signal to obtain the modulated signal.
The first of these factors is the magnetron's inherent instability in its transmitter frequency.
frequency and oscillations
The Rayleigh Criterion implies that a thermoacoustic instability can be optimally controlled by having heat release oscillations 180 degrees out of phase with pressure oscillations at the same frequency.
For example, diodes are used to regulate voltage ( Zener diodes ), to protect circuits from high voltage surges ( avalanche diodes ), to electronically tune radio and TV receivers ( varactor diodes ), to generate radio frequency oscillations ( tunnel diodes, Gunn diodes, IMPATT diodes ), and to produce light ( light emitting diodes ).
Radio waves were not detected first from a natural source, but were rather produced deliberately an artificially by the German scientist Heinrich Hertz in 1887, using electrical circuits calculated to produce oscillations in the radio frequency range, following recipies suggested by the equations of James Clerk Maxwell.
The negative resistance of the active device cancels the ( positive ) internal loss resistance in the resonator, in effect creating a resonator with no damping, which generates spontaneous continuous oscillations at its resonant frequency.
He attached an LC circuit to the electrodes of an arc lamp, and the negative resistance of the arc excited audio frequency oscillations in the tuned circuit at its resonant frequency.
For cyclical processes, such as rotation, oscillations, or waves, frequency is defined as a number of cycles per unit time.
If F is the only force acting on the system, the system is called a simple harmonic oscillator, and it undergoes simple harmonic motion: sinusoidal oscillations about the equilibrium point, with a constant amplitude and a constant frequency ( which does not depend on the amplitude ).
Ioffe asked Theremin to come to his newly founded Physical Technical Institute in Petrograd, and the next day he invited him to start work at developing measuring methods for high frequency electrical oscillations.
Or, equivalently, in terms of the wave's angular frequency ω, which specifies the number of oscillations per unit of time, and wavenumber k, which specifies the number of oscillations per unit of space, by
The wave propagates faster when higher frequency oscillations are distributed less densely in space.
In the related magnetosphere science, the lower frequency electromagnetic oscillations ( pulsations occurring below ~ 3 Hz ) are considered to lie in the ULF range, which is thus also defined differently from the ITU Radio Bands.
Radio waves were not detected first from a natural source, but were rather produced deliberately an artificially by the German scientist Heinrich Hertz in 1887, using electrical circuits calculated to produce oscillations in the radio frequency range, following recipes suggested by the equations of James Clerk Maxwell.
Mechanical systems that vibrate or oscillate will experience large amplitude oscillations when they are driven at their resonant frequency.
When the key is closed, and the apparatus in operation, there are trains of intermittent electrical oscillations set up in the circuit, and if the terminals of the secondary circuit of the oscillation transformer are near together, there is high potential high frequency oscillatory sparks passing between them.
Indeed, the power of theta frequency in the EEG increases with working memory load, and oscillations in the theta band measured over different parts of the skull become more coordinated when the person tries to remember the binding between two components of information.
However radio signals may be carried by electromagnetic radiation ; the intensity of the radiation ( amplitude modulation ) or the frequency of the radiation ( frequency modulation ) is oscillated and then the individual oscillations are varied ( modulated ) to produce the signal.
For a lightly damped linear oscillator with a resonance frequency Ω, the intensity of oscillations I when the system is driven with a driving frequency ω is typically approximated by a formula that is symmetric about the resonance frequency:
frequency and lies
The 3 dB bandwidth of an electronic filter or communication channel is the part of the system's frequency response that lies within 3 dB of the response at its peak, which in the passband filter case is typically at or near its center frequency, and in the lowpass filter is near 0 hertz.
An MRI scanner is a device in which the patient lies within a large, powerful magnet where the magnetic field is used to align the magnetization of some atomic nuclei in the body, and radio frequency fields to systematically alter the alignment of this magnetization.
The IRI can transmit between 2. 7 and 10 MHz, a frequency range that lies above the AM radio broadcast band and well below Citizens ' Band frequency allocations.
A time-domain graph shows how a signal changes with time, whereas a frequency-domain graph shows how much of the signal lies within each given frequency band over a range of frequencies.
As the commercial medium wave broadcast band lies within the frequency capability of most RDF units, these stations and their transmitters can also be used for navigational fixes.
Most lunar scientists will acknowledge that transient events such as outgassing and impact cratering do occur over geologic time: the controversy lies in the frequency of such events.
In certain situations, this spurious signal can be filtered away because the " harmonic " lies far outside the frequency range used, but in cable television, for example, third order distortion could cause a 200 MHz signal to interfere with the regular channel at 600 MHz.
Put simply, a time-domain graph shows how a signal changes over time, whereas a frequency-domain graph shows how much of the signal lies within each given frequency band over a range of frequencies.
Extreme frequency agility lies at the heart of spread spectrum techniques that have gained mainstream acceptance in computer wireless networking such as Wi-Fi.
What that actually means is that when the actual sinusoid frequency lies in bin " k ", its presence is sensed / recorded at different levels in the other bins ; i. e. the correlations they measure are non-zero.
The assumption behind Figure 5 is that the frequency f < sub > 0 dB </ sub > lies between the lowest pole at f < sub > 1 </ sub > = 1 /( 2πτ < sub > 1 </ sub >) and the second pole at f < sub > 2 </ sub > = 1 /( 2πτ < sub > 2 </ sub >).
The reflected light fluctuates in intensity, the frequency of which is equivalent to the Doppler shift between the incident and scattered light, and is thus proportional to the component of particle velocity which lies in the plane of two laser beams.
It is not possible to make any transition that lies within the energy or frequency range that is observed.
Unlike Dolby Pro Logic II's broadband logic steering, Neo: 6 is a multi-band decoder, meaning that the decoder can enhance more than one predominant signal at a time — provided each predominant signal lies in a different frequency band than the others.
The frequency of SKR lies in the range 10 – 1300 kHz ( wavelength of a few kilometers ) with the maximum around 400 kHz.
* railway-the town lies on the most important trans-Slovak railway joining Bratislava and Kosice and the local railways branch joins Nové Mesto nad Váhom with Veselí na Moravě in the Czech Republic ; EXPRESS TRAIN SERVICE from the train station-Bratislava-Kosice every 1-2h frequency, regional trains to Bratislava, Žilina, Veselí na Moravě aprx.
0.855 seconds.