# amplitude

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## 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.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

## 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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## amplitude

Of oscillation or vibration, the maximum displacement from the mean position.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

## 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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

## 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.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
In fact, the measured signal instability during the acquisition of the samples could be treated as amplitude or frequency modulation and modulation produces spectral lines around the measured signal's spectral line.
The amplitude amplification will be measured through the waves' Maximal Temporal Amplitude (MTA), a quantity measuring the highest elevation at every spatial position in the domain during the observation time.
Two-way repeated measures ANOVA revealed the significant effect of intervention [F(1,11) = 6.98, P = 0.023, partial [[eta].sup.2] = 0.388] and time [F(5,55) =2.98, P = 0.019, partial [[eta].sup.2] = 0.213] on MEP amplitudes. In addition, there was a significant interaction between intervention and time [F(5,55) =4.01, P = 0.004, partial [[eta].sup.2] = 0.267].
Figure 4 shows the dependence of the reduced complex viscosity on the reduced frequency of the decrosslinked XHDPE obtained from TSE using the compounding screws without ultrasonic treatment (a), with ultrasonic treatment at an amplitude of 10 [micro]m (b) and using the decrosslinking screws without ultrasonic treatment (c), with ultrasonic treatment at amplitudes of 10 [micro]m, (d) and 13 [micro]m, (e) at a flow rate of 6.5 g/min at a reference temperature of 160[degrees]C.
There was a marked inter-individual variability in amplitudes of N75 to P100 in both patients with diabetes and control subjects.
The average current and dither amplitude in low frequency PWM cannot be controlled independently.
Caption: Figure 7: Optimized array excitation amplitudes using IA-CP method.
Caption: FIGURE 8: Comparison of the relative change of resonant frequencies and vibrational amplitudes under different thickness of piezoelectrodes between experiments and simulations.
The above results indicate that the S0 and A0 amplitudes can reflect the w change of fractured long bones with different angles.
The additional vibrating movement of the reed has significantly lower amplitude and higher frequency comparing to the basic movement of the reed resulting from the movement of the slay [1].

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