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.

When these devices exploit their voltage-dependent variable capacitance they are known as varactors. Barring the creation of local hot spots, a non-destructive avalanche current is produced by electron-hole pair propagation when the electric field within the (*) depletion region of these devices reaches a critical value. Majority carriers exist in an energy state greater than the Fermi energy in the Schottky barrier variety and those that operate in reverse breakdown are named after Zener. For 10 pointsname these devices that allow current to pass in only one direction.
Science

In one myth, this god fails in his attempts to court his wife until he seduces her in the guise of a cuckoo. He tricks another of his lovers into turning into a fly, then swallows her, only to find out that she was pregnant and that his daughter is causing him a massive headache. In another myth, this god draws lots with his brothers to see who controls the sky, the sea, and the underworld after he castrates and overthrows his father Cronus. For 10 points, name this philandering leader of the Greek gods who is married to the jealous Hera.
Social Science

To maximize profit, firms should advertise until the ratio of advertising costs to sales revenue equals the ratio of two measures of elasticity of this concept. One variety of this concept is plotted on the y-axis of a Keynesian cross, and the cross-price elasticity of it is the change in it for one good when another's price changes. As income increases, this quantity for (*) normal goods also increases, and Giffen goods are exceptions to the law of this quantity, which states that it goes down when price increases. For ten points, identify this quantity from economics, which is negatively related to supply.

Science