incident energy density
51Luminous efficacy — is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power. Depending on context, the power can be either the radiant flux of the source s output, or it can be the total electric power consumed by… …
52Lux — For other uses, see Lux (disambiguation). A lux meter for measuring illuminances in work places. The lux (symbol: lx) is the SI unit of illuminance and luminous emittance measuring luminous power per area. It is used in photometry as a measure of …
53Candela — This article is about the unit of luminous intensity. For other uses, see Candela (disambiguation). Photopic (black) and scotopic[1] (green) luminosity functions. The photopic includes the CIE 1931 standard[2] …
54Candela per square metre — Nit (unit) redirects here. For the unit of information entropy, see Nat (information). The candela per square metre (cd/m2) is the derived SI unit of luminance. The unit is based on the candela, the SI unit of luminous intensity, and the square… …
55Operation Plumbbob — Plumbbob Priscilla Information Country United States Test site Nevada Test Site Period April October 1957 …
56Lambert (unit) — The lambert (symbol L, la or Lb) is a non SI unit of luminance named for Johann Heinrich Lambert (1728–1777), a Swiss mathematician, physicist and astronomer. A related unit of luminance, the foot lambert, is used in the lighting, cinema and… …
57Top Fuel — Racing is a class of drag racing in which the cars are run on a maximum of 90% nitromethane and about 10% methanol (also known as racing alcohol), instead of gasoline. The cars are purpose built race cars, with a layout superficially resembling… …
581/N expansion — In quantum field theory and statistical mechanics, the 1/N expansion (also known as the large N expansion) is a particular perturbative analysis of quantum field theories with an internal symmetry group such as SO(N) or SU(N). It consists in… …
59radiation measurement — ▪ technology Introduction technique for detecting the intensity and characteristics of ionizing radiation, such as alpha, beta, and gamma rays or neutrons, for the purpose of measurement. The term ionizing radiation refers to those… …
60analysis — /euh nal euh sis/, n., pl. analyses / seez /. 1. the separating of any material or abstract entity into its constituent elements (opposed to synthesis). 2. this process as a method of studying the nature of something or of determining its… …
