vacuum photocell

An evacuated photocell for demonstrating the photoelectric effect. The instrument shows that the emission of electrons increases with increasing light intensity: a useful piece of laboratory equipment for those studying atomic physics.

The Vacuum Photocell features electrical wiring and a clamping bar, and is also mounted on a base plate, sturdy and ready for use. 

technical specification

• Weight: 0.2kg
• Dimensions: 15.2 x 10.2 x 10.2cm
• Cathode: caesium on oxidised silver
• Cathode area: 2.4cm²
• Operating voltage: 50V, max. 200V
• Working resistance: 1MΩ
• Dark current: < 0.05μA
• Sensitivity: 20μA/ lumen
• Photoelectric current density: max. 3.0μA/ cm²