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Ground state energy of H-atom is -13.6 e...

Ground state energy of H-atom is -13.6 eV. The energy needed to ionise H-atom from its second excited state is

A

`1.51` eV

B

`3.4` eV

C

`13.6` eV

D

`12.1` eV

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The correct Answer is:
A
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