Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Medium-Class 12
A semiconductor is doped with a trivalent impurity. If the intrinsic carrier concentration is 1.5 x 10^10 cm^-3 and the hole concentration in the doped semiconductor is 5 x 10^17 cm^-3, what is the concentration of electrons in the doped semiconductor?
A
5 x 10^2 cm^-3
B
5 x 10^3 cm^-3
C
5 x 10^3 cm^-3
D
3 x 10^3 cm^-3
Correct Answer
Option A
Detailed Explanation
In a p-type semiconductor, the product of electron and hole concentrations equals the square of the intrinsic carrier concentration: np = ni^2. Here, n = ni^2 / p = (1.5 x 10^10)^2 / (5 x 10^17) = 4.5 x 10^2 cm^-3.
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