| Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as. |
| Assertion (A): The number of electrons in a p-type silicon semiconductor is less than the number of electrons in intrinsic silicon semiconductor at room temperature. |
| Reason (R): It is due to law of mass action. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: A
Solution :
Option [a] is correct. Explanation: In p-type semiconductor, electron is the minority charge earner. So, number of electrons is less than the number of electrons in intrinsic semiconductor. So the assertion is true. According to the law of mass action \[=n_{i}^{2}={{n}_{e}}\times {{n}_{h}}.\] In intrinsic semiconductor, \[{{n}_{e}}={{n}_{h}}\] So in p-type semiconductor \[{{n}_{e}}<{{n}_{h}}\] So reason is also true.
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