Atoms And Nuclei Question 304

Question: Energy required for the electron excitation in $ L{{i}^{+}} $ from the first to the third Bohr orbit is:

Options:

A) 36.3 eV

B) 108.8 eV

C) 122.4eV

D) 12.1 eV

Show Answer

Answer:

Correct Answer: B

Solution:

  • Energy of excitation, $ \Delta E=13.6{{\pi }^{2}}( \frac{1}{{\eta_{1}}}-\frac{1}{{\eta_{2}}} )eV $
    $ \Rightarrow \Delta E=13.6{{( 3 )}^{2}}( \frac{1}{1^{2}}-\frac{1}{3^{2}} )=108.9eV $


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