CBSE 2026 · Region 2 · Set 2 · Q2 · 1 mark
A photosensitive surface is illuminated by radiations of wavelength $\displaystyle \lambda_{1}, \lambda_{2}$ $\displaystyle \left(>\lambda_{1}\right)$ and $\displaystyle \lambda_{3}$ one by one and photoemission is observed in each case. $\displaystyle \lambda_{1}, \lambda_{2}$ lies in UV range and $\displaystyle \lambda_{3}$ in visible range. If $\displaystyle \mathrm{V}_{1}, \mathrm{~V}_{2}$ and $\displaystyle \mathrm{V}_{3}$ are stopping potential in these cases respectively, then
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle \mathrm{V}_{1}>\mathrm{V}_{2}>\mathrm{V}_{3}$
Dual Nature of Radiation and MatterExperimental Study of Photoelectric EffectApplymcqmedium
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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.