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 the balance between incoming and outgoing radiation
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.

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Physics
In a conductor

There is no conduction band
The forbidden energy gap is very wide
The valence band and the conduction band overlap each other
The forbidden energy gap is very narrow

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