A plane metallic surface of area is illuminated normally by a steady beam of…
PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter
Problem
A plane metallic surface of area 2.0cm2 is illuminated normally by a steady beam of monochromatic light of frequency 6.0×1014Hz. The intensity of the beam is 5.0×10−3Wm−2. Assume that every photon incident on the surface ejects one photoelectron and all emitted electrons are collected.
(i) Calculate the number of photons incident on the surface per second.
(ii) Determine the saturation photoelectric current in the external circuit.
(iii) Express the current obtained in part (ii) in μA."