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Physics · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 2 · Q2
A photosensitive surface is illuminated by radiations of wavelength λ_1, λ_2 (>λ_1) and λ_3 one by one and photoemission is observed in each case.…
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
(C)
$\displaystyle \mathrm{V}_{1}>\mathrm{V}_{2}>\mathrm{V}_{3}$
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