CBSE 2024 · Region 2 · Set 1 · Q9 · 1 mark
Energy levels $\displaystyle \mathrm{A}, \mathrm{B}$ and C of an atom correspond to increasing values of energy i.e. $\displaystyle \mathrm{E}_{\mathrm{A}}<\mathrm{E}_{\mathrm{B}}<\mathrm{E}_{\mathrm{C}}$. Let $\displaystyle \lambda_{1}, \lambda_{2}$ and $\displaystyle \lambda_{3}$ be the wavelengths of radiation corresponding to the transitions C to $\displaystyle \mathrm{B}, \mathrm{B}$ to A and C to A , respectively. The correct relation between $\displaystyle \lambda_{1}, \lambda_{2}$ and $\displaystyle \lambda_{3}$ is :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle \frac{1}{\lambda_{1}}+\frac{1}{\lambda_{2}}=\frac{1}{\lambda_{3}}$
AtomsThe Line Spectra of the Hydrogen AtomApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.