CBSE 2026 · Region 4 · Set 1 · Q9 · 1 mark
Radiation of wavelength $\displaystyle 331$ nm irradiates the following metals : Metal Work Function (eV) Na $\displaystyle 1.92$ K $\displaystyle 2 \cdot 15$ Ca $\displaystyle 3 \cdot 20$ Mo $\displaystyle 4.17$
Which of the following statements is correct ?
| Metal | Work Function (eV) |
| Na | $\displaystyle 1.92$ |
| K | $\displaystyle 2 \cdot 15$ |
| Ca | $\displaystyle 3 \cdot 20$ |
| Mo | $\displaystyle 4.17$ |
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Only Mo will not show photoelectric emission.
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.