In a sample of ions, a Li++ ion electron in first Bohr orbit is excited to a level by a radiation of wavelength λ. When the ion gets de-excited to the ground state in all possible ways (including intermediate emissions), a total of six spectral lines are observed. What is the value of λ ? (Given, h=6.63×10−34Js,c=3×108ms−1

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11.4 nm

9.4 nm

10.8 nm

12.3 nm

answer is C.

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Detailed Solution

6=n(n−1)2⇒n=41λ=Rz2112−1421λ=1.097×10711−116×9mλ=10.8nm

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