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If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li⁺⁺ is

Asked in JEE Main Online 2014 (also JEE Main 2003) · Energy levels and ionisation

• (1) 122.4 eV
• (2) 30.6 eV
• (3) 13.6 eV
• (4) 3.4 eV

Step-by-step solution

Why the other options are wrong

• (1) Uses the ground state.
• (3) Uses n=3.
• (4) Forgets Z².

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