CBSE 2023 · Region 2 · Set 1 · Q13 · 1 mark
In an extrinsic semiconductor, the number density of holes is $\displaystyle 4 \times 10^{20} \mathrm{~m}^{-3}$. If the number density of intrinsic carriers is $\displaystyle 1.2 \times 10^{15} \mathrm{~m}^{-3}$, the number density of electrons in it is
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle 3.6 \times 10^{9} \mathrm{~m}^{-3}$
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic SemiconductorApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.