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Prove that the ionisation energy of hydr...

Prove that the ionisation energy of hydrogen atom is 13.6 eV.

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n=1 corresponds to ground state.
`E=(-13.6)/(n^(2))eV`
`E=(-13.6)/(1^(2))eV`
`E=-13.6 eV`
`therefore` The minimum energy required to free the electron from the ground state of hydrogen atom
=13.6 eV.
`therefore` Ionisation energy of hydrogen atom = 13.6 eV.
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