The probbility of electrons to be found in the conduction band of an intrinsit semiconductor at a finile temperature
A
increase exponenially with increases band gap
B
decreases exponenially with increases band gap
C
decreases with increases temperature
D
is independent of the temperature and the band gap
Text Solution
Verified by Experts
The correct Answer is:
B
KEY CONCEPT: For a semi condactor `n = n_(0)e^(bar Eg//kT)` where `n_(0) = no ` of free electrons at absolute zero `n = no` of free electron at T kelvin, E_(g)= Energy gap , k = Boizmana constant` . As E_(g) ` increase , `n` decrease exponentially.
SUNIL BATRA (41 YEARS IITJEE PHYSICS)|Exercise Comprehension Based Questions|2 Videos
MOVING CHARGES AND MAGNETISM
SUNIL BATRA (41 YEARS IITJEE PHYSICS)|Exercise MCQs(d )|1 Videos
Similar Questions
Explore conceptually related problems
The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature
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.
What will be the probability of electrons to be found in the conduction band of an intrinsic conductor at a finite temperature with increasing band gap?
The free electron concentration (n) in the conduction band of a semiconductor at a temperature T kelvin is described in terms of E_(g) and T as-
The ratio of number of holes and number of conduction electrons in an intrinsic semiconductor is
The conductivity of a semiconductor increases with increase in temperature because
The conductivity of a semiconductor increases with increase in temperature because
Is it difficult to make an intrinsic semiconductor? Name two factors on which the electrical conductivity of intrinsic semiconductor at a given temperature depends. How does the conductivity of a semiconductor change with the rise in its temperature?
How does the conductivity of a semiconductor change if its temperature is raised ?
SUNIL BATRA (41 YEARS IITJEE PHYSICS)-MODERN PHYSICS-MCQ (One Correct Answer
