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

The electric field is E = V/d
`=( 0.50 V )/(5.0 xx 10^(-7)m ) = 1.0 xx 10^6 V//m`