CBSE 2026 · Region 2 · Set 3 · Q11 · 1 mark
The equivalent mass of a photon of wavelength $\displaystyle 100$ nm is
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle 2.21 \times 10^{-35} \mathrm{~kg}$
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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.