Question

Which group of metals can emit electrons even under visible light?

Options

• Zinc, sodium, and magnesium

• Lithium, sodium, potassium, rubidium, and caesium

• Cadmium, potassium, and magnesium

• Zinc, cadmium, and magnesium

Answer 1

Alkali metals such as lithium, sodium, potassium, rubidium, and caesium can emit even under visible light. This illustrates the dependence of photoelectric emission on the material.