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A He⁺ ion is in its first excited state. Its ionization energy is

Asked in JEE Main 9th April 2nd Shift 2019 · Energy levels and ionisation

• (1) 13.60 eV
• (2) 6.04 eV
• (3) 54.40 eV
• (4) 48.36 eV

Step-by-step solution

Why the other options are wrong

• (2) Uses n=3.
• (3) Uses n=1.
• (4) Gives the excitation energy 1→3.

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