The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature
Answer & explanation
Correct answer: option 1
The probability of electrons to be found in the conduction band of an intrinsic semiconductor $P(E)=\frac{1}{1+e^{\frac{(E-E_F)}{kT}}}$; where k = Boltzmann's constant
Hence, at a finite temperature, the probability decreases exponentially with increasing band gap.