The binding energy of an in the ground state of H-like ions in whose spectrum the third line of Balmer series is equal to 108.5 nm, is

Question

The binding energy of an  in the ground state of H-like ions in whose spectrum the third line of Balmer series is equal to 108.5 nm, is

Canvas Classes · Accepted Answer

Step 1: Identify the third line of Balmer series

Balmer series: . Lines:

Third line:

Step 2: Find energy of this transition

Step 3: Relate to binding energy

For H-like ion with atomic number :

Verification:  (He⁺ ion) ✓

Final Answer: 54.4 eV → Option (b)

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