Semiconducting Devices Question 2
Question: Assertion : The number of electrons in a P-type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature. Reason : It is due to law of mass action.
[AIIMS 2005]
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: A
Solution:
According to law of mass action, $ n _{i}^{2}=n _{e}n _{h} $ .
In intrinsic semiconductors ni = ne = nh and for P-type semiconductor ne would be less than ni, since nh is necessarily more than ni.
