The necessary condition for photo electric emission is

The frequency and work function of an incident photon are v and phi_(0) . If v is the threshold frequency then necessary condition for the emission of photo electron is

Photo electric effect

The necessary condition for saturated solution is –

The threshold wave length for photo electric emission from a material is 5,200A^(@) , photo electrons will be emitted when this material is illuminated with monochromatic radiation from а

When monochromatic light of wavelength lambda illuminates a metal surfrce, then stopping potential for photo electric current is 3V_(0) . If wavelength changes to 2lambda then stopping potential becomes V_(0) Threshold wavelength for photo electric emission is: