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Q. In a Bohr model of an atom, when an electron jumps from n = 3 to n = 1, how much energy will be emitted?

AIPMTAIPMT 1996Structure of Atom

Solution:

$ \Delta E =\left(- R _{ H } / n _{ f }^{2}\right)-\left(- R _{ H } / n _{ i }^{2}\right) $
$n _{ i } \& n _{ f }$ stands for initial and final orbit respectively
$R _{ H }=$ rydrberg's constant $=2.18 \times 10^{-18}$
$ \begin{array}{l} \Delta E =\left(-2.18 \times 10^{-18} / 3^{2}\right)-\left(-2.18 \times 10^{-18} / 1^{2}\right) \\ \Delta E =2.18 \times 10^{-18}\left(1 / 3^{2}-1\right) \\ \Delta E =1.94 \times 10^{-10} J \end{array} $