CBSE 2025 · Region 5 · Set 1 · Q12 · 1 mark
The kinetic energy of an alpha particle is four times the kinetic energy of a proton. The ratio $\displaystyle \left(\frac{\lambda_{\alpha}}{\lambda_{\mathrm{p}}}\right)$ of de Broglie wavelengths associated with them will be :
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle \frac{1}{4}$
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.