Which one of the following metals is used in the filaments of photo-electric cells that convert light energy into electric energy?
Photoelectric cell is a device using a photoelectric effect to generate current using light is called as a photoelectric cell. Photo emission takes place and the current flows in the circuit.
Rubidium is used in the filament of photoelectric cell that convert light energy into electric energy. Reasons are high ohmic resistance and less current leak.
The correct option is C.