instruction:
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
question:
One variant of this phenomenon can be used to tune the electronic properties of boron nitride nanotubes from nearly insulating to metallic. Another variant of this phenomenon is induced by interference of standing laser waves to trap atoms of a Bose-Einstein condensate loaded into an optical lattice. Schrdinger's third article from his 1926 series of papers presented his perturbation theory treatment of this effect's modification of the Balmer and Lyman series. Along with van der Waals broadening and resonance broadening, this effect can produce pressure broadening of spectral lines. In addition to the giant version and the AC or Autler-Townes form of this effect, it exhibits variants that are linear and quadratic in the applied field. FTP name this shifting and splitting of spectral lines due to an external electric field, the analogue of the Zeeman effect.
answer:
Science

question:
The aristocratic Fourteen Families survived the crash of this country's indigo industry by slavedriving their way into coffee-producing wealth, while its natoional tradition venerates the Pipil warriors who repelled Pedro de Alvorado. Occult enthusiast Maximiliano Hernandez Martinez responded to Farabundo Marti's 1932 peasant uprising in this country by initiating a brutally systematic mass murder of its citizens known as "the slaughter, or la matanza. Roberto D'Aubuisson, the founder of this country's ARENA party, was revealed to be incurably genocidal and implicated in the deaths of Rutilio Grande and Archbishop Oscar Romero. Tensions over the border near the Gulf of Fonseca were ignited by a 1970 FIFA qualifying match, leading this country and Honduras to fight the soccer war. For 10 points, name this Central American country with capital at San Salvador.
answer:
History

question:
This is the controlling parameter in a cataclysmic variable binary, in which material is lost by a body with weakly bound outer layers, like a red giant. Analogous to a similar quantity named for Oppenheimer, Tollman, and Volkoff that applies to neutron-degenerate spheres, this quantity is derived by balancing self-gravitation with the degeneracy pressure from electrons. Planetary nebula formation is one means by which stable stars can be formed from bodies initially above this, a condition which usually results in nova, since this is the maximum mass at which a white dwarf will not gravitationally collapse. For 10 points, name this cut-off equal to about 1.44 solar masses that is named for an Indian-American physicist.
answer:
Science