CBSE 2023 · Region 3 · Set 2 · Q3 · 1 mark
At a certain temperature in an intrinsic semiconductor, the electrons and holes concentration is $\displaystyle 1.5 \times 10^{16} \mathrm{~m}^{-3}$. When it is doped with a trivalent dopant, hole concentration increases to $\displaystyle 4.5 \times 10^{22} \mathrm{~m}^{-3}$. In the doped semiconductor, the concentration of electrons ( $\displaystyle \mathrm{n}_{\mathrm{e}}$ ) will be :
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle 5 \times 10^{9} \mathrm{~m}^{-3}$
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.