CBSE 2026 · Region 3 · Set 1 · Q8 · 1 mark
Radiation of wavelength $\displaystyle 200$ nm is incident on a photosensitive surface of work function $\displaystyle 4 \cdot 2$ eV. The kinetic energy of fastest photoelectrons emitted from this surface will be close to :
Official answer
From CBSE’s own marking scheme for this paper.
(D)
2.$\displaystyle 0$ eV
Dual Nature of Radiation and MatterEinstein’s Photoelectric Equation: Energy Quantum of RadiationApplymcqmedium
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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.