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Physics · 2022 · 3 marks
Dual Nature of Radiation and MatterEinstein’s Photoelectric Equation: Energy Quantum of Radiation3 marksApplyshort answer
CBSE 2022 · Region 3 · Set 3 · Q5
The work function of a metal is 2.31 eV. Photoelectric emission occurs when light of frequency 6.4 × 10^14 Hz is incident on the metal surface.…
The work function of a metal is $\displaystyle 2.31$ eV. Photoelectric emission occurs when light of frequency $\displaystyle 6.4 \times 10^{14} \mathrm{~Hz}$ is incident on the metal surface. Calculate :
(i)
the energy of the incident radiation, (ii) the maximum kinetic energy of the emitted electron and (iii) the stopping potential of the surface.
Marking-scheme solution
(ii) Maximum kinetic energy - $\displaystyle 1$
(iii) Stopping potential - $\displaystyle 1$
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CBSE Class 12 Physics past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.