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In a p-n junction, the depletion region ...

In a p-n junction, the depletion region is 400nm wide and and electric field of `5xx10^5Vm_(-1)`exists in it (a)Find the height of the potential barrier, (b)What should be the minimum kinetic energy of a conduction electron which can diffuse from the n-side to the p-side?

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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 to p side = V electron volts
`5xx10^(5)xx400xx10^(-9)=0.2eV`
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