The binding energy of an electron in the ground state of hydrogen-like ions in whose spectrum, the t

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

Accepted Answer

$\frac{1240}{108.5} = B.E.\left( \frac{1}{2^{2}} - \frac{1}{5^{2}} ight) \Rightarrow B.E. = 54.4	ext{ eV}$

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