Physics
Which one among the following doesn't have any effect on velocity of sound ?

Humidity
Temperature
Density
Pressure

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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 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 the balance between incoming and outgoing radiation

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