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When impurities are added to semiconductors, the conductivity

A. increases

B. increases then decreases

C. decreases

D. remains constant

QUICK ANSWER…

A

DETAILS…

Pure semiconductors are not desirable in construction of electronics due to their poor level of conductivity. To improve the quality and conductivity of pure semiconductors, certain impurities are introduced in a process known as DOPING.

Now for the right answer to the above question:

1. Option A is correct. the doping introduces free electrons and holes which are the main carriers of electricity in semiconductors.
2. Option B is incorrect. it increases and never decreases.
3. C is incorrect.
4. D is not the correct answer. it does not remain constant.

KEY-POINTS…

You may please note these/this:

• A semiconductor doped with impurities will conduct electricity better and faster than a pure semiconductor.

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/ culled from 2015 JAMB-UTME physics question 31 /