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In a p-n junction hole with kinetic energy 250 mev approaches the junction from m-side . The potential barrier is 200 mev. What will be its kinetic energy when it crosses the junction .

$(a)\;200\;mev \\ (b)\;50\;mev \\ (c)\;450\;mev \\ (d)\;cannot\; cross\; the\; junction $
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Kinetic energy of hole increases when reverse biased in the p-n junction
Kinetic energy of the hole $= 200+250\;mev$
$\qquad =450 \;mev$
Hence c is the correct answer.
answered Jan 27, 2014 by meena.p

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