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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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