question_answer

Ultraviolet light is incident on two photosensitive materials having work functions \[{{W}_{1}}\] and \[{{W}_{2}}({{W}_{1}}>{{W}_{2}})\]. In which case will the kinetic energy of the emitted electrons be greater? Why?

Answer:

                K.E. of a photoelectron \[=hv-{{W}_{0}}\] Hence the kinetic energy of the emitted electrons will be greater for the photo-sensitive material having smaller work function \[{{W}_{2}}.\]