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In a p-n junction, the thickness of depl...

In a p-n junction, the thickness of depletion region is `2xx10^(-7)m` and potential barrier across the junction is 0.20 V
(a) What will be the intensity of electric field in this region ?
(b) if an electron, from n-side approaches the p-n junction with speed `5xx10^(5) m//s`. then with what speed it will enter the p-side ?

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