# amplitude

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Related to amplitude: amplitude modulation

## amplitude

(ăm`plĭto͞od'), in physics, maximum displacement from a zero value or rest position. In the harmonic motionharmonic motion,
regular vibration in which the acceleration of the vibrating object is directly proportional to the displacement of the object from its equilibrium position but oppositely directed.
of a pendulum, the amplitude of the swing is the greatest distance reached to either side of the central rest position. Amplitude is important in the description of a wavewave,
in physics, the transfer of energy by the regular vibration, or oscillatory motion, either of some material medium or by the variation in magnitude of the field vectors of an electromagnetic field (see electromagnetic radiation).
phenomenon such as light or sound. In general, the greater the amplitude of the wave, the more energy it transmits (e.g., a brighter light or a louder sound).

## amplitude

1. Symbol: δm . The difference between the maximum and minimum magnitudes of a variable star, i.e. the range in magnitude of the star. The amplitude of pulsating variables is related to the logarithm of the period.
2. The maximum instantaneous deviation of an oscillating quantity from its average value.

## amplitude

[′am·plə‚tüd]
(astronomy)
The range in brightness of a variable star, usually expressed in magnitudes.
(mathematics)
The angle between a vector representing a specified complex number on an Argand diagram and the positive real axis. Also argument.
Angular distance north or south of the prime vertical; the arc of the horizon, or the angle at the zenith between the prime vertical and a vertical circle, measured north or south from the prime vertical to the vertical circle.
(physics)
The maximum absolute value attained by the disturbance of a wave or by any quantity that varies periodically.

## amplitude

Of oscillation or vibration, the maximum displacement from the mean position.

## amplitude

i. The amplitude of a wave is the maximum displacement, or the maximum value, it attains from its mean position during a cycle. It is both positive and negative. With sound waves, the greater the amplitude, the louder is the sound.
ii. Angular distance north or south of the prime vertical; the arc of the horizon or the angle at the zenith between the prime vertical and a vertical circle, measured north or south from the prime vertical circle. The term is used customarily only to refer to bodies whose centers are on the celestial horizon and is prefixed “E” or “W” as the body is rising or setting, respectively, and suffixed “N” or “S” to agree with the declination.

## amplitude

1. Astronomy the angular distance along the horizon measured from true east or west to the point of intersection of the vertical circle passing through a celestial body
2. Maths (of a complex number) the angle that the vector representing the complex number makes with the positive real axis. If the point (x, y) has polar coordinates (r, θ), the amplitude of x + iy is θ, that is, arctan y/x
3. Physics the maximum variation from the zero or mean value of a periodically varying quantity

## amplitude

The strength or volume of a signal, usually measured in decibels. See wavelength.

Amplitude The amplitude is the power of a signal. The greater the amplitude, the greater the energy carried.
References in periodicals archive ?
5, 1, 2, and 3 MPa at an ultrasonic amplitude of 10 [micro]m and a bubble volume fraction of 0.
In the current study, comparing low vibration amplitude (0.
4, the average current and dither amplitude according the PWM frequency and duty cycle were estimated from the mathematical model.
GRAPHICAL REPRESENTATIONS OF AMPLITUDE FUNCTION [psi](u,v,[phi])
Therefore, any increase in the distance may have a significant effect on the latency and amplitude of the recorded waves.
Setting the reference current values is performed by a separate assembly operating at a stable frequency (over the range 0 Hz-200 Hz) and amplitude (0 V-10 V), which also contains the soft-start and soft-stop circuits having adjustable times of starting and stopping the drive.
Em relacao a amplitude houve diferencas significativas para os potenciais P1 (amplitude media de 5,18[micro]V para o genero feminino e 4,33[micro]V para o genero masculino), amplitude de P3 (amplitudes medias de 6,83[micro]V para o genero feminino e 4,45[micro]V para o masculino no metodo marcando no papel), amplitude de P2 (amplitudes medias de 5,62[micro]V para o genero feminino e 4,36[micro]V para o genero masculino no metodo contando mentalmente) (Figura 4).
The variation of the amplitude along the flap span is determined by integrating the velocity signal of the laser Doppler vibrometer [v.
Previous studies have demonstrated prolonged F wave duration [sup] and latency, [sup] increased F wave amplitude, [sup] F wave chronodispersion [sup] and F wave persistence [sup] in UMN lesions, such as stroke, [sup] multiple sclerosis, [sup] etc.
Conclusion: Significant changes in terms of reduction of P-wave amplitude and left ward rotation of P-wave axis occur after effective treatment of acute exacerbation of COPD.
We used three-way ANOVA to assess P500 latency and mean peak P500 amplitude with one between-subjects factor (group membership) and two within-subjects factors (rotation and electrode placement) and using the Greenhouse--Geisser method for correction of significance levels.
The amplitude of the shock blows, Farid said, was quite big reaching 40 millimeters.

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