CBSE 2025 · Region 1 · Set 1 · Q10 · 1 mark
Let $\displaystyle \lambda_{\mathrm{e}}, \lambda_{\mathrm{p}}$ and $\displaystyle \lambda_{\mathrm{d}}$ be the wavelengths associated with an electron, a proton and a deuteron, all moving with the same speed. Then the correct relation between them is
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle \lambda_{\text {e }}>\lambda_{\text {p }}>\lambda_{\text {d }}$
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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.