Q. Doping of a semiconductor (with small traces of impurity atoms) generally changes the resistivity as follows
A) Does not alter
B) Increases
C) Decreases
D) May increase or decrease depending on the dopant
Explanation
(c) By doping a semiconductor with some impurity atoms increases the conductivity and hence decreases the resistivity (as $\rho = 1/\sigma$).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.