Physics
In a bipolar junction transistor

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
The collector has the least concentration of impurity

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Physics
For an ideal gas, which one of the following statements does not hold true?

The kinetic energies of all gas molecules are not same
The speed of all gas molecules is same
There is no interactive force between the molecules.
The potential energy of the gas molecules is zero

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