Physics
Why does'nt the hydrogen atom emit X-rays?

It has only one electron
It is very small in size
It is highly electropositive
Its energy levels are very close to each other

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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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