Ratio of maximum resistivity to intrinsic resistivity max

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Ratio of maximum resistivity to intrinsic resistivity max / i is expressed as—

1. µn + µp / 2 µp
2. µn + µp / µnµp
3. µn + µp / 2 µnµp
4. µn + µp / 2 µn

Correct Option: C

It will first increase exponentially upto a temperature T then remain constant at 10¹⁵ cm^{– 3} over the remaining range