Why are Caesium and Potassium used as electrodes in photoelectric cells whereas Rubidium is not used?
Why are Caesium and Potassium used as electrodes in photoelectric cells whereas Rubidium is not used?
Dear user,
Rubidium is also used as electrodes in photoelectric cells.
The following solids are best suited to convert the sunlight into the electricity.
Potassium
Rubidium
Caesium
The ejection of electrons from these metals are easy when light fall on them because their threshold energy (also called work function) is comparatively low. This is the minimum energy required to eject the electrons from metal surface. Because in the functioning of photoelectric cells electrons must be emitted and these elements have low ionisation energies which means they lose electrons easily. The low energy photons (light) can eject electrons from their metal surface.
Dear user,
Rubidium is also used as electrodes in photoelectric cells.
The following solids are best suited to convert the sunlight into the electricity.
Potassium
Rubidium
Caesium
The ejection of electrons from these metals are easy when light fall on them because their threshold energy (also called work function) is comparatively low. This is the minimum energy required to eject the electrons from metal surface. Because in the functioning of photoelectric cells electrons must be emitted and these elements have low ionisation energies which means they lose electrons easily. The low energy photons (light) can eject electrons from their metal surface.
