Physics
In a bipolar junction transistor

The emitter has the least concentration of impurity
All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The collector has the least concentration of impurity
The base has the least concentration of impurity

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Physics
Analog synthesis refers to a technology based on

Representing data in terms of measurable physical quantities.
Representing physical quantities as numbers.
Interfacing synthesizer equipment.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.

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