Physics
A doppler effect occurs when a source of sound moves

Towards you
Away from you
None of these
Both A & B

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

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.
It is the balance between incoming and outgoing radiation
It is the amount of heat which the surface of earth receives from the sun.

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Physics
What is refractive index ?

None of above
It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.

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