Round 7: Tossup 11

A highly doped type of these circuit components that displays negative resistance due to quantum tunneling was (15[1])developed by Leo Esaki. Four of these components in a namesake “bridge” convert AC to DC in a common type of rectifier. These components may experience avalanche breakdown above the Zener voltage, (15[1])and they are symbolized on a circuit diagram by a (*) triangle pointing into a line. A p-n junction makes up one of these components, which have a forward or reverse bias. Ideally, these components only allow current to flow in one direction. (-5[1])For 10 points, name these components which have a “light-emitting” type. (10[1])■END■ (10[1])

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