The ejection of the photoelectron from the silver metal in the photoelectric effect experiment cann be stoped 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, E=hv=work function of a metal+Kinetic energy of photoelectrons
or, `E=hv=h(c)/(lamda)=((6.626xx10^(-34)J*s)xx(3xx10^(8)m*s^(-1)))/((256.7xx10^(-9)m))`
or, `E=7.74xx10^(-19)J=4.83eV" "(because 1eV=1.602xx10^(-19)J)`
The potential applied proved the kinetic energy to the electron. thus, kinetic energy of the electron=0.35 eV. so, work function of silver metal=(4.83-0.35)eV=4.48eV