Physics
At constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. It is the statement of

Boyle's Law
Charle's Law
Avogadro's Law
Gay-Lussac's Law

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Physics
In a bipolar junction transistor

The base 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 emitter has the least concentration of impurity

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