Lesson Progress
0% Complete
They are used in
I. Photometer
ii. Burglar alarms
iii. Automatic door
iv. Television cameras
v. Counting operations
vi. Sound production from film track
When light of appropriate frequency falls on the cathode photosensitive surface, electrons are emitted. Since the anode is positive with respect to cathode, electrons are attracted to the anode, and the flow of electrons completes the circuit and current flows.
Responses