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Q)

In extrinsic semiconductors

(a) The gap between conductivity band and valance band is $ 10^2\; ev $

(b) The gap between conductivity band and valance band is $10\; ev$

(c)The gap between conducting band and valance band is about $ev$

(d)The conductivity band and valance band overlap

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A)
In extrinsic semiconductor the gap between conductivity band and valance band is about $ 1\;ev$
Hence c is the correct answer.
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