Physics
Natural radioactivity was discovered by

Marie Curie
Ernest Rutherfor
Henri Becquerel
Enrico Fermi

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Physics
In a bipolar junction transistor

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
The base has the least concentration of impurity

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