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

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

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Physics
A balloon filled with hydrogen will

Reach a particular height and start coming down
Continue going upwards uninterrupted
Burst after reaching some height
Reach a particular height and remain floating

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