n-type Semiconductor Electron Concentration – Rankers Physics

Properties of Semiconductors: Practice Problem & Solution

Assertion (A): The number of electrons in n-type semiconductor is higher than the number of electrons in a pure silicon semiconductor. Reason (R): The law of mass action is applicable only to n-type semiconductors.
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Properties of Semiconductors. Understanding the underlying formula is key to arriving at the correct answer below:

In n-type semiconductors, donor impurities increase the number of free electrons, making Assertion (A) true. The law of mass action (\(n_e n_h = n_i^2\)) is a fundamental principle applicable to all types of semiconductors (intrinsic, n-type, p-type), so Reason (R) is false.

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Similar Practice Questions

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1. Consider the following statements (A) and (B) and identify the correct answer. (A) A zener diode is connected in reverse bias, when used as a voltage regulator. (B) The potential barrier of \(p\)-\(n\) junction lies between 0.1 V to 0.3 V.
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