Physics
Two stones of different masses are dropped simultaneously from the top of a building

Both the stones reach the ground at the same time
Depends on the composition of the stone
Smaller stone reaches the ground earlier
Larger stone reaches the ground earlier

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Physics
In a bipolar junction transistor

The emitter has the least concentration of impurity
The base has the least concentration of impurity
The collector 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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