MHT CET Physics question

Not in JEE Advanced syllabus

The conductivity of a semiconductor increases with increase in temperature, because

(A)number density of free current carries increases
(B)relaxation time increases
(C)both number density of carries and relaxation time increase
(D)number density of carries increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number densityCorrect

Answer: (D)

Solution

With rising temperature the carrier density rises sharply while the relaxation time decreases due to more lattice scattering, but the carrier

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Question ID VK-075031