A potential barrier of 0.50V exists across a p-n junction.(a) If the depletion region is `5.0xx10^(-7)`m wide,what is the intensity of the electric field in this region?(b) An electron with speed`5.0xx10^(5)m s^(-1)`approaches the p-n junction form the n-side.With what speed will it enter the p-side?

Explanation

(i) Width of depletion layer `DeltaL=5xx10^(-7)m,E=(V)/(DeltaL)=(0.5V)/(5xx10^(-2))=10^(6)"volt/m"`
(ii) Work energy theorm ` (1)/(2)Mv_(1)^(2)=eV+(1)/(2)Mv_(1)^(2)rarrv_(f)=sqrt((Mv_(1)^(2)-2eV)/(M))=2.7xx10^(5)m//s`