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.

[EX Q]: A version of spectroscopy that is free of one form of this effect uses a standing wave to give radiation to a moving atom and is named for its two-photon transition. Due to this effect, atoms observe laser resonance leading to the phenomenon of optical molasses at its namesake cooling limit. Mossbauer spectroscopy uses this effect to modulate the energy of the incident gamma rays. An experiment that used a canal ray tube and a mirror to view light emissions was used to detect the transverse form of this effect, while its relativistic form involves changes equal to the square root of one plus beta over one minus beta. For 10 points, name this shift in the wavelength from a moving source that can be heard by an observer.
[EX A]: Science

[EX Q]: The vocal part in the sixth movement is given with the instruction "without regard for the tempo," and that movement is labeled "Farewell. " Its first section contains the repeated line "Dark is life, is death," and features a tenor singing in his upper ranges. Movements of this piece include "Of Youth," "Of Beauty," and "The Lonely Soul in Autumn," while its first takes its name from the drunken poems of a certain poet. FTP, name this work that contains the movement "The Drinking Song of Earth's Miser," a song cycle by Gustav Mahler partly based on the poetry of Li Po.
[EX A]: Fine Arts

[EX Q]: This chemical phenomenon was first modeled by Longuet-Higgens, who devised a loop method to represent it. One formulation of it says that if a given type of polyatomic system has two or more branches that intersect at one point, then at least one has no extemum at that point. The dynamic version of this phenomenon is enhanced by decreasing the Debye temperature and happens where the time frame is short. It is comparatively weak in tetrahedral complexes since the ligands are out of alignment with the appropriate orbitals, whereas it is strong in octahedral crystal fields; it's best attested in Copper(II) complexes with 3 electrons in the E-sub-g level. It happens when the lowest energy level of a non-linear molecular system spontaneously attempts to remove degeneracy and form a system of lower symmetry. FTP, name this doubly-eponymous effect, a distortion in chemical geometry to lower energy.
[EX A]:
Science