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Q.

The ionisation potential of a hydrogen like species is 36 volt. What is the value of excitation energy from ground state to 1st excited state (in e V)?

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answer is 27.

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Detailed Solution

I.P. of hydrogen =  36 volt

The excitation energy from ground state to 1st excited state,E is found as,

IP =KZ2 =36

36112−122

E=27eV

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