Physics
Sound is heard over longer distances on rainy days because

Sound travels slowly in moist air
Moist air absorbs sound
Moist air does not absorb sound
Sound travels faster in moist air

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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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