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If the electron energy is -3.4 eV , Find the principal quantum number of H-atom?

$(a)\;3\qquad(b)\;1\qquad(C)\;2\qquad(d)\;4$

$E_n = \large\frac{E_1}{E_2}$
(Since $E_1$ for H-atom = -13.6 eV
Or $n^2 = \large\frac{E_1}{E_2}$
$= \large\frac{-13.6}{-3.4}=4$
$\therefore$ n = 2

edited Jan 24, 2014