value of band gap

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• Gap — or The Gap may refer to:General* Gap (clothing retailer), a chain of retail clothing stores * Gap (ecology), a spacing between large trees in a forest * Gap (landform), a mountain pass, often carved by a river * Gap year, a prolonged period… …   Wikipedia

• Direct and indirect band gaps — In semiconductor physics, the band gap of a semiconductor is always one of two types, a direct band gap or an indirect band gap. The band gap is called direct if the momentum of electrons and holes is the same in both the conduction band and the… …   Wikipedia

• Spark-gap transmitter — A spark gap transmitter is a device for generating radio frequency electromagnetic waves. These devices served as the transmitters for most wireless telegraphy systems for the first three decades of radio (1887 ndash;1916) and the first… …   Wikipedia

• Propaganda (band) — Infobox Musical artist Name = Propaganda Background = group or band Origin = Düsseldorf, Germany Genre = Synthpop Dance pop Electronic music New Wave Years active = 1982–1990 2005 present Label = ZTT Virgin Amontillado Music Associated acts = Die …   Wikipedia

• Brass Band Sections in Britain — There are five main brass band sections in Great Britain: Championship, 1st, 2nd, 3rd and 4th. The top bands are in the Championship section, and the bottom ones in the 4th section. Sometimes, a Youth Section is also used, although this is not… …   Wikipedia

• electricity — /i lek tris i tee, ee lek /, n. 1. See electric charge. 2. See electric current. 3. the science dealing with electric charges and currents. 4. a state or feeling of excitement, anticipation, tension, etc. [1640 50; ELECTRIC + ITY] * * *… …   Universalium

• colour — /kul euhr/, n., adj. v.t., v.i. Chiefly Brit. color. Usage. See or1. * * * I Aspect of any object that may be described in terms of hue, brightness, and saturation. It is associated with the visible wavelengths of electromagnetic radiation, which …   Universalium

• radiation 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… …   Universalium

• Multijunction photovoltaic cell — Multi junction solar cells or tandem cells are solar cells containing several p n junctions. Each junction is tuned to a different wavelength of light, reducing one of the largest inherent sources of losses, and thereby increasing efficiency.… …   Wikipedia

• materials science — the study of the characteristics and uses of various materials, as glass, plastics, and metals. [1960 65] * * * Study of the properties of solid materials and how those properties are determined by the material s composition and structure, both… …   Universalium

• Semiconductor — Citations missing|date=March 2008A semiconductor is a solid material that has electrical conductivity in between a conductor and an insulator; it can vary over that wide range either permanently or dynamically. [. They are used in many… …   Wikipedia