CBSE 2026 · Region 2 · Set 2 · Q5 · 1 mark
In Bohr model of hydrogen atom, an electron makes a transition from $\displaystyle \mathrm{n}=4$ state to $\displaystyle \mathrm{n}=1$ state and a photon of frequency $\displaystyle v$ is emitted. The frequency of photon emitted when an electron makes a transition from $\displaystyle \mathrm{n}=4$ state to $\displaystyle \mathrm{n}=2$ state in the same model is
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle \frac{v}{5}$
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.