Physics
Even after sunset, the air near the Earth's surface continue to receive heat due to

Insolation
Terrestrial Radiation
Conduction
Convection

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Physics
In a bipolar junction transistor

The emitter 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 base has the least concentration of impurity

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