Physics (Essay) Paper 2 WASSCE (PC), 2022

Question 3

 

(a)        State one difference intrinsic and extrinsic semiconductors.
(b)        Draw and label suitable diagrams to distinguish between an insulator and a semiconductor.

Observation

 

The expected response:
(a) Difference between Intrinsic and Extrinsic Semiconductors
                         


Intrinsic

Extrinsic

Equal number of charge carriers/pure/undoped

Unequal number of charge carriers/impure/doped

Lower electrical conductivity

Higher electrical conductivity

                                                                         
(b)  Difference between an insulator and a semiconductor