The ejection of the photoelectron from the silver metal in the photonelectric effect exeriment can be stopped by applying the voltage of `0.35 V` when the radiation `256.7 nm` is used. Calculate the work function for silver metal.

Explanation

Energy of incident radiation = Work function + Kinetic energy of photoelectron
Energy of incident raidation `(E)`
`=hv=h c/lambda`
`=((6.626xx10^(-34)J s)(3.0xx10^(8) m s^(-1)))/((256.7xx10^(-9)m))`
`=7.74xx10^(-19)J`
`=4.83 eV(1 eV=1.602xx10^(-19)J)`
The potential applied gives the kinetic energy to the electron.
Hence, kinetic energy of the elecyron`=0.35 eV`
:. Work function `4.83 eV-0.35 eV=4.48 eV`