Physics
Rainbow is due to

absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets
refraction and reflection of sunlight by water droplets
ionisation of water deposits

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

It is the balance between incoming and outgoing radiation
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 radiation from the earth in the form of long waves.

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