In a p-n junction diode, the depletion region is 400 nm wide and an electric field of `5 xx 10^5 V//m` exists in it. The minimum kinetic energy of a conduction electron which can diffuse from n side to p side is

Explanation

The p.d across the junction V = Ed
But change in K.E. = work done
`therefore ` the K.E required to conduct electron from n side top side = V electron volts
` = 5 xx 10^5 xx 400 xx 10^(-9) = 0.2 eV `