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.
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Question: This man gives his name, along with that of Francis Sears, to a process in ultrasonic imaging for which the acoustic wavefronts act as optical gratings to diffract the light on either side of the central spot. The distance over which charge carriers in plasmas exclude electric fields via his namesake shielding is also known as his namesake length. With an assistant later famous in his own right for his rule for determining whether ring molecules would show aromatic properties, he developed a mathematical expression to explain characteristics of electrolytic solutions, the famous equation named for him and Erich Hckel. FTP name this man who also gives his name to the SI unit defined as about 3.3 x 10-30 Coulomb meters, which measures the molecular dipole moment.

Answer: Science


Question: This country produced a film whose title character rebels against Pedro de Ursua during a search for El Dorado, Aguirre, the Wrath of God. In another film from this country, Francis and Jane investigate the sleepwalking Cesare, who is kept in the title object. The title sea vessel of another film from this country is heavily damaged after refueling in La Spezia and a majority of its crew is killed in a facility bombing. Two other films from here involve Elsie's murder by Beckert and Rotwang's creation of Maria's robot double. This country produced The Cabinet of Dr. Caligari, Das Boot, M, and Metropolis. For 10 points, name this country home to the director Fritz Lang.

Answer: Fine Arts


Question: A double analytic continuation of this type of solution reveals the "bubble of nothing" instability of the Kaluza-Klein vacuum, as discovered by Edward Witten. Recently, a correspondence between a chiral half of a two-dimensional conformal field theory and those of extremal Kerr type has been suggested. Above a minimum temperature, anti de Sitter space has a phase transition to a space containing one of these, as shown by Page and Hawking. They have entropy proportional to their area, and a temperature proportional to their surface gravity. Supermassive ones lie at the center of most or all galaxies. For 10 points, what are these objects in general relativity, discovered originally by Karl Schwarzschild, from which light does not escape

Answer:
Science