Physics
The motion of a body that repeats itself after a regular interval of time is

An oscillatory motion
A periodic motion
An aperiodic motion
A simple harmonic motion

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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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