In hydrogen atom, energy of the first ex...

In hydrogen atom, energy of the first excited state is `-3.4 eV`. The K.E. of the same orbit of H-atoms is :

A

`+3.4 eV`

B

`+6.8 eV`

C

`-13.6 eV`

D

`+13.6 eV`

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The correct Answer is:

A

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