A photocell is a device that operates using the photoelectric effect. What metal would enable a photocell to be operated using visible light?
A) manganese (φ = 4.1 eV)
B) lanthanum (φ = 3.5 eV)
C) cesium (φ = 1.95 eV)
D) beryllium (φ = 4.98 eV)

Question

Quizplus · Accepted Answer

The metal with the lowest work function (φ) will enable a photocell to be operated using visible light. The work function of cesium is the lowest of the four metals listed, making it the best choice for a photocell that operates using visible light.

A Photocell Is a Device That Operates Using the Photoelectric