As shown in figure a metal plate (cathode C) and another metal plate (anode A) are placed inside evacuated glass tube.
A quartz window is sealed on tube from which ultraviolet radiation can pass through it and ultraviolet radiation can pass through it and irradiate photosensitive plate C.
Monochromatic ultraviolet radiation having sufficiently low wavelength is incident on cathode (C )Thorugh quartz window W.
Electrons are emitted from plate (Cathode C) Whic are attracted by collector (anode) plate A and due to this flow of electron current is formed.
Potential difference between emitter (C ) and collector (A) can be measured by voltmeter. current produced is of the order of `muA` range which can be measured by micro ammeter connected.
By changing photosensitive surface on plate also can be changed and change in photocurrent can be studied.
Intensity and frequency of radiation incident of collector plate (C )can be varied and change in photoelectric current can be studied.
Filter or coloured glass of different colour can be placed between plate (C )and path of incident radiation and light of different frequencies can be used.
By changing distance between light source and plate (C ) can be varied.
