Light of power and wavelength falls normally on a clean potassium surface of area
PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter
Problem
Light of power 4.0mW and wavelength 400nm falls normally on a clean potassium surface of area 0.50cm2. The quantum efficiency of the surface for this wavelength is 20%.
(i) Determine the number of photons incident on the surface each second.
(ii) Calculate the number of photoelectrons emitted per second from the surface.
(iii) Find the saturation current expected in the circuit and state its value in μA."