Physics
Which of the following options correctly explains the term heat budget?

It is the radiation from the earth in the form of long waves.
It is a mode of transfer of heat through matter by molecular activity.
It is the amount of heat which the surface of earth receives from the sun.
It is the balance between incoming and outgoing radiation

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Physics
In a bipolar junction transistor

The emitter 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
The base has the least concentration of impurity

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