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

This mythological figure died when a piece of a boat fell on him while he was sleeping. While on the island of Lemnos, this man fathered twin sons with Hypsipyle. Although not Cadmus, this man sowed a field with dragon's teeth as part of a series of tasks. Those tasks were given to him by King Aeetes, who ruled the island of Colchis. This man's uncle Pelias recognized him from his single sandal, and sent him on a mission where had gained the assistance of a sorceress. This man married Medea during a quest in which he searched for the golden fleece. For 10 points, name this hero, the leader of the Argonauts.
Social Science

It began with the capture of Hangzhou, and ended with the rebellion of Zhu Yuanzhang. During it, a second capital at Khanbalik was established and the project of extending the Great Canal connecting the Yangtze and the Yellow Rivers to that capital was begun. Its first capital had been at Karakorum and this dynasty's name was taken when it's rulers looked outside their own language, taking the Chinese name for "first. "  Succeeding the Sung Dynasty and lasting from 1279 to 1368, FTP, identify this period of Mongol rule in China.

History