monochromatic emission
51Sodium vapor lamp — A sodium vapor lamp is a gas discharge lamp which uses sodium in an excited state to produce light. There are two varieties of such lamps: low pressure and high pressure . Low pressure sodium Low pressure sodium (LPS) lamps, also known as sodium… …
52Emissivity — The emissivity of a material (usually written ε or e) is the relative ability of its surface to emit energy by radiation. It is the ratio of energy radiated by a particular material to energy radiated by a black body at the same temperature. A… …
53Bohr–Einstein debates — The Bohr–Einstein debates is a popular name given to what was actually a series of epistemological challenges presented by Albert Einstein against what has come to be called the standard or Copenhagen interpretation of quantum mechanics. Since… …
54Muon spin spectroscopy — is an experimental technique based on the implantation of spin polarized muons in matter and on the detection of the influence of the atomic, molecular or crystalline surroundings on their spin motion. The motion of the muon spin is due to the… …
55HiPER — The High Power laser Energy Research facility (HiPER), is an experimental laser driven inertial confinement fusion (ICF) device undergoing preliminary design for possible construction in the European Union starting around 2010. HiPER is the first …
56David L. Webster — For other people named David Webster, see David Webster (disambiguation). David Locke Webster Born November 6, 1888 …
57Nuisances lumineuses — Pollution lumineuse L’expression pollution lumineuse (light pollution en anglais) est utilisée à la fois pour désigner la présence nocturne anormale ou gênante de lumière et les conséquences de l éclairage artificiel nocturne sur la faune, la… …
58Pollution lumineuse — L’expression pollution lumineuse (light pollution, ou photopollution pour les anglophones) désigne à la fois la présence nocturne anormale ou gênante de lumière et les conséquences de l éclairage artificiel nocturne sur la faune, la flore, la… …
59Basov, Nikolay Gennadiyevich — ▪ 2002 Soviet physicist (b. Dec. 14, 1922, Usman, near Voronezh, Russia d. July 1, 2001, Moscow, Russia), was corecipient of the Nobel Prize for Physics in 1964 with Aleksandr M. Prokhorov, his colleague at the P.N. Lebedev Physical… …
60Search for extraterrestrial intelligence — The search for extraterrestrial intelligence is sometimes abbreviated as SETI. For other uses, see SETI (disambiguation). Screen shot of the screensaver for SETI@home, a distributed computing project in which volunteers donate idle computer power …
