Question: In semiconductors, what is the effect of doping?

Options:

1. It increases the conductivity by adding impurities.
2. It decreases the conductivity by removing electrons.
3. It creates a vacuum in the material.
4. It makes the material completely non-conductive.

Correct Answer: It increases the conductivity by adding impurities.

Solution:

Doping is the process of adding impurities to a semiconductor to increase its conductivity by creating free charge carriers.