Question

Assertion: The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature decrease exponentially with increasing band gap.
Reason: It will be more difficult for the electron to cross over the large band gap while going from valence band to conduction band.
A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true not but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer 1

Correct Answer - A
To jump from valence band to conduction band electron needs energy equal or more than the forbidden band between these two bands. As the energy of band gap increases, it becomes difficult for electron to get that equivalent energy