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Answer: D. Sodium

Answer: (d) Sodium

Visible photons have energies of about 1.8 eV to 3.1 eV. Sodium (an alkali metal) has a low work function, about 2.3 eV, so visible light can eject electrons from it. Zinc, cadmium and magnesium have work functions of roughly 3.7 to 4.3 eV and need ultraviolet radiation.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report
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