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19/08/2021 12:55 pm
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The wave number of electromagnetic radiation emitted during the transition in between two energy levels of Li2+ ion whose principal quantum number sum is 4 and difference is 2, is
(a) 3.5 RH
(b) 4 RH
(c) 8 RH
(d) 8/9 RH
1 Answer
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19/08/2021 1:03 pm
Correct answer: (c) 8 RH
Explanation:
n1 + n2 = 4 .....(i)
n2 - n1 = 2 .....(ii)
n1 = 1, n2 = 3
\(\bar v\) = RHZ2 \(\Big(\frac{1}{n_1^2} - \frac{1}{n^2_2} \Big)\)
= RH x 32 x \(\Big[\frac{1}{1^1} - \frac{1}{3^2} \Big]\)
= 8 RH