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  4. Which of the following is the energy of a possible excited state of hydrogen?

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Q. Which of the following is the energy of a possible excited state of hydrogen?

JEE MainJEE Main 2015Structure of Atom

Solution:

$\therefore E_{n}=-\frac{13.6}{n^{2}} eV $
where, $n=1,2,3 \ldots$
In excited states, $E_{2}=\frac{-13.6}{4}=-3.4\, eV$