Physics
In a bipolar junction transistor

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

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 0°C
Density of the substance to the density of water at 4°C
Density of water at 4°C to the density of the substance
Density of the substance to the density of water

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