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

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Physics
Isotopes of an element contain

equal number of protons and electrons
equal number of nucleons
the same number of neutrons but different number of protons
the same number of protons but different number of neutrons

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