# amplitude

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amplitude
/am"pli toohd', -tyoohd'/, n.
1. the state or quality of being ample, esp. as to breadth or width; largeness; greatness of extent.
2. large or full measure; abundance; copiousness.
3. mental range, scope, or capacity.
4. Physics. the absolute value of the maximum displacement from a zero value during one period of an oscillation.
5. Elect. the maximum deviation of an alternating current from its average value.
6. Astron. the arc of the horizon measured from the east or west point to the point where a vertical circle through a heavenly body would intersect the horizon.
7. Math. argument (def. 8b).
[1540-50; < L amplitudo. See AMPLE, -I-, -TUDE]

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in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path. The amplitude of a pendulum is thus one-half the distance that the bob traverses in moving from one side to the other. Waves are generated by vibrating sources, their amplitude being proportional to the amplitude of the source.

For a transverse wave, such as the wave on a plucked string, amplitude is measured by the maximum displacement of any point on the string from its position when the string is at rest. For a longitudinal wave, such as a sound wave, amplitude is measured by the maximum displacement of a particle from its position of equilibrium. When the amplitude of a wave steadily decreases because its energy is being lost, it is said to be damped.

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Universalium. 2010.

Synonyms:

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• amplitude — [ ɑ̃plityd ] n. f. • XVe; lat. amplitudo 1 ♦ Vx Grandeur, étendue. « Dans l amplitude et immensité de la nature » (Pascal). 2 ♦ Sc. Différence entre les valeurs extrêmes d une grandeur. Amplitude d un intervalle borné : distance entre les bornes …   Encyclopédie Universelle

• Amplitude — is the magnitude of change in the oscillating variable, with each oscillation, within an oscillating system. For instance, sound waves are oscillations in atmospheric pressure and their amplitudes are proportional to the change in pressure during …   Wikipedia

• Amplitude — Am pli*tude, n. [L. amplitudo, fr. amplus: cf. F. amplitude. See {Ample}.] 1. State of being ample; extent of surface or space; largeness of dimensions; size. [1913 Webster] The cathedral of Lincoln . . . is a magnificent structure,… …   The Collaborative International Dictionary of English

• Amplitude [1] — Amplitude, wird in der Mathematik in verschiedenen Fällen als Bezeichnung für Winkel von spezieller Bedeutung gebraucht. So nennen manche Amplitude einer komplexen Zahl (a + ib) den durch die Gleichung a + ib = r (cosφ + isinφ)… …   Lexikon der gesamten Technik

• amplitude — AMPLITUDE. s. f. Dans le jet des bombes, c est la ligne horizontale comprise entre le point d où part la bombe, et celui où elle va tomber. L amplitude du jet.Amplitude, en Astronomie, est l arc de l horizon compris entre le vrai levant ou le… …   Dictionnaire de l'Académie Française 1798

• amplitude — of displacement at a point in a vibrating system is the largest value of displacement that the point attains with reference to its equilibrium position. double amplitude peak to peak amplitude static amplitude stress amplitude …   Mechanics glossary

• Amplitude — Sf Schwingungsweite per. Wortschatz fach. (19. Jh.) Entlehnung. Entlehnt und übertragen aus l. amplitūdo ( dinis) Größe, Weite, Erhabenheit , Abstraktum von l. amplus umfangreich, geräumig, groß .    Ebenso nndl. amplitude, ne. amplitude, nfrz.… …   Etymologisches Wörterbuch der deutschen sprache

• Amplitude — amplitudė statusas T sritis automatika atitikmenys: angl. amplitude vok. Amplitude, f; Schwingungsweite, f rus. амплитуда, f pranc. amplitude, f …   Automatikos terminų žodynas

• amplitude — amplitudė statusas T sritis automatika atitikmenys: angl. amplitude vok. Amplitude, f; Schwingungsweite, f rus. амплитуда, f pranc. amplitude, f …   Automatikos terminų žodynas

• amplitudė — statusas T sritis automatika atitikmenys: angl. amplitude vok. Amplitude, f; Schwingungsweite, f rus. амплитуда, f pranc. amplitude, f …   Automatikos terminų žodynas

• Amplitude — amplitudė statusas T sritis Standartizacija ir metrologija apibrėžtis Didžiausias virpamojo dydžio nuokrypis nuo pusiausvyros padėties. Amplitudinę vertę virpamasis dydis kiekviename virpesių pusperiodyje pasiekia tik vieną kartą. atitikmenys:… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas