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For approximately ten times increase in conductivity of a semiconductor the impurity to be added is of the order of

$(a)\;1\;in \;1000\;parts \\ (b)\;1\;in \;100\;parts \\ (c)\;1\;in \;10^8\;parts \\ (d)\;1\;in \;1^{10}\;parts $

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For 10 times increase in conductivity of a semiconductor the impurity to be added in the order of 1 in $10^8$ parts
Hence c is the correct answer.
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