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A potential barrier of 0.3V exists acros...

A potential barrier of `0.3V` exists across a `p-n` junction.
(a) if the depletion region is `1mum` width. What is the intensity of elctric field in this region ?
(b) An electron with speed `5xx10^(5)m//sec` approaches this `p-n` junction from `n`-side, what will be its speed on entering the `p`-side?

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