Amplitude
The amplitude of a wave is the peak value (i.e. the height) of the wave in the positive or negative direction.
For example, for a general sine wave: ...
Amplitude
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The amplitude is a nonnegative scalar measure of a wave's magnitude of oscillation, that is, the magnitude of the maximum disturbance in the medium during one wave cycle.
Amplitude modulation is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave....
the incident light (by amplifying or attenuating some frequencies more than others).
Amplitude: the maximum variation strength of an electromagnetic wave in one wavelength.
Angstrom: A unit of length equal to one ten-billionth of a meter (about four-billionth of an inch); often used to measure the wavelength of light.
amplitude The maximum deviation of a wave above or below the zero point.
amplitude occasive: a 17th century term for the sun's azimuth at sunset.
amplitude ortive: a 17th century term for the sun's azimuth at sunrise.
anaphoric (clock): a clock with a dial face like an astrolabe, showing seasonal hours.
Amplitude Modulation
(AM) A type of modulation in which the amplitude of a carrier wave is modulated by an imposed signal, usually at audio frequency.
Amplitude
The size of a wave from the top of a wave crest to its midpoint.
Angular Momentum ...
Amplitude Modulation
telescope
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Real amplitudes differ considerably, not only because of global topography as explained above, but also because the natural period of the oceans is in the same order of magnitude as the rotation period: about 30 hours.
A finite-amplitude hydrodynamic disturbance which is propagated through a fluid without any change of shape. MHD solitons are also known. [H76]
Solstice ...
The speed, amplitude, and direction the seismic waves move depend on the particular type of wave and the material they pass through.
Generally the amplitudes of the brightness variations are of the order of one magnitude, the largest variation known being 3.4 magnitudes (V342 Aquilae).
pulse amplitude (NASA Thesaurus / NASA SP-7, 1965) A general term indicating the magnitude of a pulse.
For specific designation, adjectives such as average, instantaneous, peak, root-mean-square (effective), etc.
- the intensity or amplitude of the scintillation, determined as: (1) visible in direct vision, (2) visible only in peripheral vision, or (3) not visible
- the visual shape and frequency of the scintillation ...
The mean rotational amplitude for asteroids is about a factor of 1.3. These data, together with the assumptions mentioned above, allow astronomers to estimate asteroid shapes, which occur in a wide range (see Figure 61).
PAM (abbr)= pulse amplitude modulation. PAM/FM (abbr) Frequency modulation of a carrier by pulses which are amplitude modulated by information.
A 3-hourly "equivalent amplitude" index of local geomagnetic activity; "a" is related to the 3-hourly K INDEX according to the following scale: K 0 1 2 3 4 5 6 7 8 9 a 0 3 7 15 27 48 80 140 240 400 A INDEX.
AM radio uses amplitude modulation, in which higher air-pressure at the microphone causes higher transmitter power.
The number (i) expressing the ratio of the two amplitudes is a function of the following quantities: - (T) the volume of the disturbing particle; (r) the distance of the point under consideration from it; (A) the wave-length; ...
However, a circular orbit for such a companion with a period of 100 yr would produce a velocity amplitude of at most about ±6 km s-1.
In these so-called adiabatic fluctuations, the temperature amplitude we see is 1/3 the density amplitude (which traces back to photon density varying as T³).
Observed light-curve amplitudes for asteroids range from zero to a factor of 6.5, the latter being the case for the Apollo asteroid Geographos.
Atmospheric pressure is 7 mbar, varying with an amplitude of 2 mbar as volatiles are vaporized and recondense at the poles. The south polar cap is permanent, and is composed predominantly of solid carbon dioxide with some water.
In particular, shock waves travel faster than sound, and their speed increases as the amplitude is raised; but the intensity of a shock wave also decreases faster than does that of a sound wave, ...
Though actually classed as a "semi-regular" variable (technically an "SRb" star), such stars (or at least part of the sample) are now thought to be just low-amplitude Miras.
This consisted of three piezo-element detectors mounted on a special metallic plate to measure the amplitude of the wave generated by dust particles heavier than 1E-10 g impacting on the plate.
The longitudinal side-to-side oscillation, on the other hand, has an amplitude of only a quarter of a minute of arc, much too small to be measured by ordinary telescope-based methods.
If you know the shape and amplitude of the MF and how it changes with time you can distinguish cosmological models of the evolution of the Universe.
"The inner planet of the 61 Vir system is among the two or three lowest-amplitude planetary signals that have been identified with confidence," says Butler.
If these two waves collide and have the same amplitude, they will mutually cancel. That is, for every positive point along one wave, the second wave would have a negative counterpart of the same magnitude.
The inclination of the ecliptic in relation to the invariable plane also goes through cycles of varying amplitude, with a period of about 100,000 years. It is currently 1.58°, as noted, and decreasing.
A number of techniques are used to predict the amplitude of a cycle during the time near and before sunspot minimum.
A type of supergiant pulsating variable star, of spectral type A or B, that undergoes non-radial pulsations with a period of 5 to 10 days and a visual amplitude of 0.1 magnitude or less, named for the prototype, Alpha Cygni (Deneb).
Most have a period of between 5 -10 days and an amplitude range of 0.5 - 2.0 magnitudes in visible light. The variations are less pronounced at infrared wavebands. They are 1.5 - 2 magnitudes more luminous than Type II Cepheids.
Its amplitude is about 0.7 arcseconds (about 15 meters on the surface) with a period of 433 days. It combines with another wobble with a period of one year, so the total polar motion varies with a period of about 7 years.
A Dictionary of Computing entry for quadrature amplitude modulation
A Dictionary of Computing entry for QAM
A Dictionary of Computing entry for Gaussian quadrature
A Dictionary of Computing entry for adaptive quadrature ...
neap tide: Ocean tide of low amplitude occurring at first- and third-quarter moon.
nebula: A cloud of gas and dust in space.
nebular hypothesis: The proposal that the solar system formed from a rotating cloud of gas.
Continuous Wave (CW) transmission is when there is an electromagnetic carrier wave present and the message signal, be it voice, video or data, is impressed upon the carrier by modulating its amplitude, phase or frequency.
The magnitude of an earthquake is calculated from the logarithm of the amplitude of waves recorded by seismographs. Beno Gutenberg also contributed to the more general application of the Richter scale. A magnitude 2.
In electromagnetics, an operation converting the vector electromagnetic wave to a scalar time series proportional to either the amplitude or the power of the wave, with or without an accompanying angular time series.
Shape also contains an m=2 mode of 3.11 km amplitude [3].
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50,024 ...
The amplitude of the waves, he said suggested the mass of the unobserved object and the wavelength of the ripples revealed the moon's possible position. Using this mathematical model, Dr.
The information is presented as a mixture of signal properties such as frequency, phase, amplitude and in some cases repetitive patterns. Also present is information that can be mathematically assembled into 'radio pictures' of these cosmic objects.
The amplitudes of the two waves add up, and amplification of the incoming wave has taken place. Masers make use of those transitions in molecules or crystals that correspond to the energies of microwave or radio frequencies.
Some fifteen supergiants are members of this group (including kappa Cas). The period ranges from five to ten days and the amplitude is less than 0.1 magnitude. For alpha Cygni, the range is 1.21 to 1.29.
So if light is a wave phenomenon, then two light sources produce waves that in some places produce large amplitudes and other places produce zero.
Irregular variables show no periodicity in their variations in brightness. The amplitude of their fluctuations in brightness is in general smaller than the fluctuations of the long-term regular variables.
the Sun and Moon also cause small periodic variations, due to their changing positions. These oscillations, in both precessional speed and axial tilt, are known as the nutation. The most important term has a period of 18.6 years and an amplitude of ...
The star is a model for the category of stars known as Mira variables. Mira variables are pulsating variable stars, usually red giants, with pulsation periods longer than 100 days and light amplitudes exceeding one magnitude.
 See also: Time, Light, Period, Earth, Field
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