Q.Give the construction and working of photo emissive cell.

Step 1. Construction: the photo emissive cell consists of an evacuated glass or quartz bulb containing two electrodes -- a semi-cylindrical cathode C coated with photosensitive material, and a thin rod-shaped anode A held along the axis at the centre of the semi-cylinder. A potential difference is maintained between A and C through a circuit that includes a galvanometer G and a battery B.

Step 2. Working: when the curved cathode C is illuminated by suitable radiation, it emits photoelectrons.

Step 3. These photoelectrons are attracted across the evacuated bulb to the central anode A, producing a current in the external circuit that is measured by the galvanometer. …

Describe the physical construction (semi-cylindrical cathode, central rod anode, evacuated bulb) and then the working (illuminat …

• Confusing which electrode (cathode or anode) is photosensitive and …