A cylindrical source of light which emits radiation radially (from a curved surface) only, placed at the center of a hollow, metallic cylindrical surface, as shown in the diagram.
The power of the source is 90
watt and it emits light of wavelength 4000 A
only. The emitted photons strike the metallic cylindrical surface which results in the ejection of photoelectrons. All ejected photoelectrons reach the anode (light source). The magnitude of photocurrent in amp is [Given:h=6.4×10−34J/sec]