The ionisation energy of `H` atom is `21.79xx10^(-19) J`. The the value of binding energy of second excited state of `Li^(2+)` ion

Monjur Alahi

The ionisation energy of `H` atom is `21.79xx10^(-19) J`. The the value of binding energy of second excited state of `Li^(2+)` ion
A. `3^(2)xx21.7xx10^(-19)J`
B. `21.79xx10^(-19) J`
C. `1/3xx21.79xx10^(-19) J`
D. `1/3^(2)xx21.79xx10^(-19) J`


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Salim Ahmed Kawsar

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Correct Answer - B
B.E.`=(21.79xx10^(-19)(3)^(2))/((3)^(2))=21.79xx10^(-19)J`

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