fechner law
41Lightness (color) — Three hues in the Munsell color model. Each color differs in value from top to bottom in equal perception steps. The right column undergoes a dramatic change in perceived color. Lightness (sometimes called value or tone) is a property of a color …
42Apparent magnitude — Asteroid 65 Cybele and 2 stars with their magnitudes labeled The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere.… …
43Perception — For other uses, see Perception (disambiguation). Perceptual redirects here. For the Brian Blade album, see Perceptual (album). Robert Fludd s depiction of perception (1619) …
44List of logarithm topics — This is a list of logarithm topics, by Wikipedia page. See also the list of exponential topics.*Acoustic power *antilogarithm *Apparent magnitude *Bel *Benford s law *Binary logarithm *Bode plot *Henry Briggs *Cologarithm *Common logarithm… …
45Decibel — This article is about the ratio of measures. For sound or acoustic level, see Sound pressure. For other uses, see Decibel (disambiguation). Attenuation chart of an RG 6 Coaxial cable, measured in decibels per 100 feet of cable The decibel (dB) is …
46Sone — The sone was proposed as a unit of perceived loudness by S. Smith Stevens in 1936. In acoustics, loudness is the subjective perception of sound pressure. Although defined by Stevens as a unit, it is not one of the SI units. Such units meet the… …
47Progressive tax — A progressive tax is a tax imposed so that the tax rate increases as the amount subject to taxation increases. [ [http://www.merriam webster.com/dictionary/Progressive Webster] (4b): increasing in rate as the base increases (a progressive tax)] [ …
48weber — /web euhr, vay beuhr/, n. Elect. the SI unit of magnetic flux and magnetic pole strength, equal to a flux that produces an electromotive force of one volt in a single turn of wire when the flux is uniformly reduced to zero in a period of one… …
49Weber — /vay beuhr/ or, Ger., /vay beuhrdd/ for 1 3, 5; /web euhr/ for 4, n. 1. Ernst Heinrich /erddnst huyn rddikh/, 1795 1878, German physiologist. 2. Baron Karl Maria Friedrich Ernst von /kahrddl mah rddee ah frddee drddikh erddnst feuhn/, 1786 1826,… …
50Weber — This page is about the surname. Below, there is list of people bearing this name and other uses of the word.Weber is a surname of German origin, derived from the noun meaning weaver . The German pronunciation is IPA2|ˈveˌbɐ , while in English it… …
