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2023 WAEC Physics Theory a. State one difference between an intrinsic and an extrinsic semiconductor.   b. Draw a circuit...

Physics
WAEC 2023

a. State one difference between an intrinsic and an extrinsic semiconductor.

 

b. Draw a circuit diagram to illustrate full wave smoothing rectification.

 

 

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Explanation

a. – Extrinsic semiconductors are produced by adding impurities into pure semiconductors, while intrinsic semiconductors are always present in their most pure state.
- Extrinsic semiconductors have a high electrical conductivity in comparison to other materials at room temperature, while intrinsic semiconductors have a low electrical conductivity.
- In intrinsic semiconductors, the number of electrons and holes is equal, however, this is not the case in extrinsic semiconductors.
- Temperature alone determines the behavior of intrinsic semiconductors, whereas extrinsic semiconductors are influenced by both temperature and the number of impurities present.
- n-type and p-type semiconductors are two categories of extrinsic semiconductors, while intrinsic semiconductors are not further subdivided.

b. diagram above


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