CBSE 2024 · Region 5 · Set 1 · Q12 · 1 mark
A pure Si crystal having $\displaystyle 5 \times 10^{28}$ atoms $\displaystyle \mathrm{m}^{-3}$ is dopped with $\displaystyle 1$ ppm concentration of antimony. If the concentration of holes in the doped crystal is found to be $\displaystyle 4.5 \times 10^{9} \mathrm{~m}^{-3}$, the concentration (in $\displaystyle \mathrm{m}^{-3}$ ) of intrinsic charge carriers in Si crystal is about
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle 1.5 \times 10^{16}$
Semiconductor Electronics: Materials, Devices and Simple CircuitsIntrinsic SemiconductorApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.