CBSE Class 12 · 2023 · Modern PhysicsMultiple Choice

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Which one of the following metals does not exhibit emission of electrons from its surface when irradiated by visible light?

(A)Rubidium
(B)Sodium
(C)Cadmium✓ Correct
(D)Caesium

Answer: (C)

Solution

Alkali metals (rubidium, sodium, caesium) have low work functions and emit electrons under visible light.
Cadmium has a comparatively high work function (high threshold frequency, in the ultraviolet), so visible light cannot eject its electrons.

(C) Cadmium

CBSE Class 12 Board · 2023 · Single correct option

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