Question

Which metals generally require ultraviolet radiation for photoelectric emission?

Options

• Rubidium, caesium, and sodium

• Lithium, sodium, and potassium

• Lithium, zinc, and caesium

• Zinc, cadmium, and magnesium

Answer 1

Zinc, cadmium, and magnesium generally require ultraviolet radiation. Their response differs from that of the listed alkali metals, which can emit under visible light.