Question

Let np and ne be the numbers of holes and conduction electrons in an extrinsic semiconductor.
(a) np > ne
(b) np = ne
(c) np < ne
(d) np ≠ ne

Answer 1

In an extrinsic semiconductor,  np ≠ ne.

Explanation:

Extrinsic semiconductor

• Which an impurity controls the rate in addition to make it conductive for a semiconductor is called extrinsic semiconductor.
• There are two types of semiconductors p type and n type semiconductor.
• The semiconductor which results in doping, for negative n-type semiconductor that has an extra electrons and one fewer electrons for positive p type semiconductor.
• Moderately and lightly the semiconductors are doped.
• In addition of trivalent impurities which are made from extrinsic semiconductor are called p type.
• 'Number of holes is more than number of electrons' in p type semiconductor.
• In addition of pentavalent impurities which are made from extrinsic semiconductor are called n type.
• 'Number of electrons is more than number of electrons' in n type semiconductor.
• Hence, the number of electrons and holes are not equal.

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1. https://brainly.in/question/11330308
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Answer 2

Let np and ne be the numbers of holes and conduction electrons in an extrinsic semiconductor is np ≠ ne. From the question, it is understood that ne and np are the numbers of conduction electrons and holes in an extrinsic semiconductor.

Explanation:

The formation of the extrinsic semiconductor is either by doping a p-type material or doping an n-type material with a pure semiconductor.

So, this will have more number of electrons if the n-type doping material is used, or more number of holes if p-type doping material is used.