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The ionisation energy of hydrogen atom i...

The ionisation energy of hydrogen atom is `13.6 eV`, the ionisation energy of a singly ionsed helium atom would be

A

`13.6` eV

B

`27.2` eV

C

`6.8` eV

D

`54.4` eV

Text Solution

Verified by Experts

The correct Answer is:
D
`E_(2)^(1) = (2)^(2) E_(1) = 4 xx 13.6 = 54.4 eV`
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