Physics
The ordinary and maximum tolerance limit of sound by human being is

70 db to 85 db (decibel)
65 db to 75 db (decibel)
60 db to 80 db (decibel)
50 db to 70 db (decibel)

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

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

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