Intrinsic Semiconductor Conductivity – Rankers Physics

Properties of Semiconductors: Practice Problem & Solution

Assertion (A): The conductivity of an intrinsic semiconductor depends on its temperature. Reason (R): No important electronic device can be developed using intrinsic semi conductor.  
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 an intrinsic semiconductor, conductivity increases with temperature due to increased generation of electron-hole pairs. So Assertion (A) is true. Intrinsic semiconductors have limited practical use due to low conductivity, making Reason (R) true in terms of 'important' devices. However, (R) does not explain (A).

Leave a Reply

Your email address will not be published. Required fields are marked *

Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. For an electronic valve, the plate current I and plate voltage V in the space charge limited region are related as (1992)
2. In a PN junction: (2002)
3. Assertion (A): P-type semiconductor has high density of holes in valence band while N-type semiconductor has high density of electrons in conduction band. Reason (R): In N-type semiconductor, as the density of donor atoms (N_D) is increased, the fermi energy level shifts towards the valence band.  
4. Assertion (A): Working principle of photodiode and photocell is same. Reason (R): Biasing circuit for photodiode and photocell is same.  
5. Assertion (A): Semiconductors do not obey Ohm's law. Reason (R): Electric current is determined by the rate of flow of charge carriers.