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Physics · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 1 · Q12
In Bohr model of hydrogen atom, the electron makes a transition from n =5 to n = 1 state. As a result, a photon of wavelength λ is emitted in the…
In Bohr model of hydrogen atom, the electron makes a transition from $\displaystyle \mathrm{n}=5$ to n = $\displaystyle 1$ state. As a result, a photon of wavelength $\displaystyle \lambda$ is emitted in the process. The wavelength of the photon emitted when an electron makes a transition from energy level $\displaystyle \mathrm{n}=5$ to $\displaystyle \mathrm{n}=2$ will be
Official answer
(D)
$\displaystyle \frac{32}{7} \lambda$
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.