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]: Instead of employing the Debye-Hull-Scherrer powder method, its namesakes relied on an array of atomic planes. Its namesakes built a vacuum apparatus and employed a hot filament, an accelerating electrode, and an arc-mounted Faraday box. A leak in the vacuum led its namesakes to heat the target, resulting in crystallized nickel, which gave startling results. A plot of collector current against beam energy was explained by constructive interference, and the results in general could be derived by combining Bragg's equation with the de Broglie wavelength for electrons. FTP name this experiment named for two physicists, which proved that electrons diffract.
[EX A]: Science

[EX Q]: First proposed by Lewis, it is related logarithmically to a gas's standard Gibbs free energy divided by the temperature and gas constant. At equilibrium, this quantity must be equal in both gas and liquid phases. Taking the derivative of the natural log of this function is equates it to the derivative of a reaction's chemical potential. Equal to the gas' pressure when the gas is ideal, FTP, identify this thermodynamic quantity which replaces partial pressure when working with real gases and describes the tendency of a substance to escape from its current phase, symbolized by f.
[EX A]: Science

[EX Q]: One story about this battle says that the baggage train of one side's rear force was attacked by a band of peasants led by three knights, who stole jewels and a crown, leading to a panic in which that side ordered the killing of all of its prisoners. Casualties on one side included Michael de la Pole and Edward of Norwich, while the Duke of Barabant arrived late from a christening party. The losing side's vanguard was commanded by the Marshal Boucicaut, Jean le Maingre, and was notably decimated by longbowmen in this contest which saw the Constable Charles d'Albret defeated on St. Crispin's Day. For 10 points, name this big victory for Henry V in 1415 during the Hundred Years War.
[EX A]:
History