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 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 balance between incoming and outgoing radiation

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Physics
Isotopes of an element contain

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

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